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The first phase (431–421 BC) was named the Ten Years War, or the Archidamian War, after the Spartan king Archidamus II, who invaded Attica several times with the full Hoplite army of the Peloponnesian League, the alliance network dominated by Sparta (then known as Lacedaemon)
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Historians have traditionally divided the war into three phases
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Several battles took place during the Peace of Nicias. The Sicilian Expedition was an Athenian military campaign in Sicily from 415–413 BCE. The ambitious invasion, intended to conquer the city of Syracuse and cut off Spartan grain supplies, resulted in the almost destruction of the Athenian expedition and marked a major turning point in the war
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The Sicilian disaster prompted the third phase of the war (413–404 BC), named the Decelean War, or the Ionian War
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Often called the "Golden Age of India," this period saw massive advancements in science, mathematics (including the concept of zero), and art.
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The Qin Dynasty unified China for the first time, establishing the imperial system and beginning construction on the Great Wall of China.
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The ruler of the Mali Empire traveled to Mecca, distributing so much gold that he reportedly caused a decade of inflation in Egypt.
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A plague pandemic that killed around 75-200 million people
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Johannes Gutenberg’s movable type press revolutionized the spread of information, fueling the Renaissance and Reformation.
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These battles marked the start of what would later become known as the Revolutionary War
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Although a British victory, it proved the colonial militia could stand their ground against a professional army.
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The 13 colonies declared their separation from Great Britain, a moment influenced by European Enlightenment ideals.
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Washington’s surprise attack on Trenton boosted morale after a series of colonial defeats.
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British General John Burgoyne achieved a small tactical victory but suffered twice as many casualties as the Americans (nearly 600 British vs. 300 Americans).
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After waiting in vain for reinforcements from New York City, Burgoyne attacked again. American forces, led aggressively by Benedict Arnold, broke the British lines and forced a retreat.
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On October 17, 1777, General Burgoyne surrendered his entire army of approximately 6,000 men to American General Horatio Gates. This was the first time in history a British army had surrendered in the field.
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While no battles were fought there, it is considered a decisive turning point in the American Revolutionary War because it was where the "ragtag" colonial militias were transformed into a professional, disciplined fighting force.
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Negotiated by Benjamin Franklin, this was the first U.S. military alliance, providing critical support for the Revolutionary War.
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The final major battle where British General Cornwallis surrendered to combined American and French forces.
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Great Britain formally recognized American independence, officially ending the Revolutionary War.
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The French Revolution was a period of radical social and political upheaval that saw the collapse of the absolute monarchy and the rise of democratic ideals like "Liberty, Equality, Fraternity."
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Facing a financial crisis, King Louis XVI convened representatives from the clergy, nobility, and commoners, which quickly broke down over voting rights.
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Locked out of their meeting hall, the Third Estate (commoners) vowed not to disperse until they had written a new constitution for France.
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Parisians attacked the royal fortress to seize gunpowder and weapons, a symbolic moment often cited as the start of the Revolution.
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The National Assembly adopted this foundational document, asserting that "men are born and remain free and equal in rights".
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A mob of women demanding bread marched on the palace, forcing the royal family to relocate to Paris.
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The Haitian Revolution was a successful insurrection by enslaved Africans against French colonial rule in Saint-Domingue, making it the only known slave rebellion in human history to result in the founding of a state ruled by former captives.
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A traditional religious gathering led by Dutty Boukman that sparked a massive, coordinated slave uprising across the island.
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conflict between free people of color and white colonial forces in the West Province.
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The monarchy was officially abolished, and France was declared a republic.
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Eli Whitney’s invention revolutionized the cotton industry by automating the separation of seeds from fiber.
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Facing a military crisis with British and Spanish invasions, the French Civil Commissioners in Saint-Domingue took the radical step of freeing enslaved people to win their support for the Republic. Léger-Félicité Sonthonax (Northern Province) issued a general emancipation proclamation on August 29, 1793. Étienne Polverel (Western and Southern Provinces) followed with similar decrees between August and October 1793
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A violent period led by Maximilien Robespierre where thousands of "enemies of the state"—including Marie Antoinette—were executed.
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The King was guillotined for treason, signaling a radical turn in the revolution.
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The French National Convention in Paris ratified the local actions in Saint-Domingue and officially abolished slavery throughout the entire French Empire. This decree was influenced by the arrival of three deputies from the colony—a white colonist, a mixed-race mulatto, and a Black former enslaved person—who argued that only abolition could save the colony for France.
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Napoleon Bonaparte seized power in a coup d'état, effectively ending the revolutionary period and establishing himself as the First Consul.
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Napoleon sent General Leclerc to restore slavery; Louverture was betrayed, arrested, and died in a French prison in 1803.
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A major engagement near Gonaïves where Toussaint Louverture’s forces resisted the invading French army led by General Rochambeau.
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One of the most famous and desperate battles of the war. Jean-Jacques Dessalines led approximately 1,300 rebels in a three-week defense of a fort against 18,000 French troops. Though they eventually abandoned the fort, the defenders inflicted massive casualties (roughly 1,500 French dead) and proved their military resolve.
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The U.S. purchased a massive territory from Napoleonic France, nearly doubling its size and signaling its westward ambitions.
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The Battle of Vertières (November 18, 1803) was the final and decisive major engagement of the Haitian Revolution. It pitted the rebel Indigenous Army against the French expeditionary forces commanded by General Donatien de Rochambeau near Cap-Français.
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Following a decisive victory at the Battle of Vertières, Jean-Jacques Dessalines proclaimed the independent Republic of Haiti, making it the first nation to permanently and universally abolish slavery in its constitution.
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Often called the "Second War of Independence," it was a byproduct of the global Napoleonic Wars between Britain and France
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President James Monroe declared that the Western Hemisphere was closed to further European colonization
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Samuel Morse developed the telegraph and Morse code, enabling near-instantaneous long-distance communication
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John Collins Warren performed the first successful surgery using ether at Massachusetts General Hospital.
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Ended the Mexican-American War and annexed territories including California and the Southwest.
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Commodore Matthew Perry's mission ended Japan's self-imposed isolation, opening its ports to American trade.
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The war officially starts when Confederate forces bombard Fort Sumter in South Carolina.
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This battle was the first major land battle of the Civil War. Confederate forces routed the Union army, which retreated in chaos toward Washington, D.C.. This battle is where General Thomas J. Jackson earned the nickname "Stonewall" for his steadfast defense on Henry House Hill.
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This battle marks the first duel between ironclad warships, the USS Monitor and the CSS Virginia.
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This victory cleared the way for Lee to launch his first invasion of the North, leading to the Maryland Campaign and the Battle of Antietam. General Robert E. Lee’s Confederate Army of Northern Virginia decisively defeated Union forces under Major General John Pope.
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This battle was the bloodiest single day in American history. The Union victory allows Lincoln to issue the preliminary Emancipation Proclamation.
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This is a turning point in the war as it changes the war's purpose to include the abolition of slavery.
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This battle ends Robert E. Lee's second invasion of the North and is often cited as the war's turning point.
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The Union's victory over the Confederacy gives it complete control of the Mississippi River, effectively splitting the Confederacy in two.
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Lincoln delivers the Gettysburg Address at the dedication of the Soldiers' National Cemetery.
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Under William T. Sherman, the Union captures Atlanta, a major industrial hub.
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Abraham Lincoln is re-elected as President, ensuring the war will continue until the Union is restored.
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Congress passes the 13th Amendment, formally abolishing slavery.
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General Robert E. Lee surrenders to Ulysses S. Grant at Appomattox Court House, marking the effective end of the war.
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Abraham Lincoln is assassinated at Ford's Theatre; he dies the following morning.
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Confederate President Jefferson Davis is captured in Georgia.
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Known as "Seward's Folly," this treaty with Russia added 586,000 square miles to the U.S. for $7.2 million.
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Japan ended its isolationist policy and the Tokugawa shogunate, rapidly modernizing into a global power.
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This artificial waterway connected the Mediterranean to the Red Sea, drastically shortening trade routes between Europe and Asia.
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Thomas Edison perfected a commercially viable electric lighting system, fundamentally changing urban life and work hours.
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European powers met to divide Africa into colonies, an event known as the "Scramble for Africa".
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Following a swift victory over Spain, the U.S. gained Puerto Rico, Guam, and the Philippines, emerging as a trans-oceanic power.
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A diplomatic note issued by Secretary of State John Hay calling for equal trading rights for all nations in China.
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Orville and Wilbur Wright achieved the first controlled, sustained flight of a powered aircraft in Kitty Hawk, North Carolina
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A German U-boat sinks a British liner, killing 128 Americans
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Italy switches sides
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A massive, months-long battle between French and German armies
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Major naval battle between British and German fleets
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Over 1 million casualties occur in this Allied offensive
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A blueprint for world peace used as the basis for the armistice ending World War I.
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Germany launches the "Spring Offensive" on the Western Front, gaining ground but suffering heavy losses
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The Allied "Hundred Days Offensive" begins, breaking German lines
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Alexander Fleming's discovery launched the antibiotic era, drastically increasing human life expectancy.
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The collapse of the U.S. market triggered the Great Depression, a global economic crisis.
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I do not mean that India's independence only lasted this long, but that this is how long it took for India to obtain independence
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while mass murder intensified from 1941, persecution began in 1933 with Hitler's rise to power
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The U.S. was a leading architect and founding member of the UN, established to maintain international peace.
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Japan formally surrenders, ending WW2
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The end of British colonial rule led to the partition of the subcontinent and the birth of two sovereign nations
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This policy established that the U.S. would provide aid to nations threatened by communism, marking the start of the Cold War.
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Developed at Bell Labs, this device became the fundamental building block of modern electronic devices.
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A massive foreign aid program launched to help revive European economies after the war.
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The Berlin Airlift, codenamed Operation Vittles, was one of the first major international crises of the Cold War. It began after the Soviet Union blockaded all land, rail, and water routes into Allied-controlled West Berlin in an attempt to force the Western powers to abandon the city.
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The first U.S. peacetime military alliance, designed to provide a collective defense against Soviet expansion.
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NATO is formed by the U.S. and its Western allies for mutual defense.
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Mao Zedong proclaiming the People’s Republic of China shifts the global balance of power.
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On June 25, 1950, approximately 89,000 North Korean troops crossed the 38th parallel, launching a massive surprise invasion of South Korea. The South Korean forces (ROKA) were overwhelmed and lacked the equipment to halt the rapid movement of the KPA, which was supported by Soviet-made tanks.
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In the U.S., it is often overshadowed by World War II and the Vietnam War despite causing an estimated 2.5 to 5 million deaths, including a high percentage of civilians, earning it the nickname "The Forgotten War".
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The Inchon Landing, codenamed Operation Chromite, was a daring amphibious assault that fundamentally reversed the tide of the Korean War. Led by General Douglas MacArthur, the operation aimed to break the North Korean stranglehold on the peninsula by landing forces deep behind enemy lines.
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The war settled into a brutal war of attrition near the 38th Parallel, characterized by trench warfare and sporadic, bloody battles for small hills.
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Jonas Salk developed the first successful vaccine against polio, leading to its near-total eradication.
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The Hydrogen Bomb was roughly 2,500 times more powerful than the Hiroshima bomb.
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Joseph Murray performed the first successful living donor kidney transplant in Boston.
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Following the French defeat at the Battle of Dien Bien Phu, the Geneva Accords split the country at the 17th Parallel.
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The Warsaw Pact is formed by the Soviet Union and its satellite states in response to West Germany joining NATO.
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The USSR develops the first ICBM (Intercontinental Ballistic Missile), capable of hitting the U.S. from Soviet territory.
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Explorer 1 was launched into orbit, marking the beginning of the U.S. presence in space.
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U.S. radar mistakenly identified the moon rising as a fleet of thousands of Soviet missiles.
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The largest man-made explosion in history.
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A B-52 bomber broke up in mid-air, dropping two 4-megaton nuclear bombs. One bomb plunged into a field and went through nearly all its firing steps; only a single low-voltage safety switch prevented it from detonating over the East Coast.
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The Berlin Wall physically separated East and West Berlin
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A Soviet submarine (B-59) was being harassed by U.S. Navy depth charges. Cut off from communication, the captain believed World War III had begun and ordered a nuclear torpedo to be armed. Launching required unanimous consent from three officers; while two agreed, Vasili Arkhipov refused, effectively preventing a nuclear launch.
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Banned nuclear testing in the atmosphere, outer space, and underwater.
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The mouse was invented at SRI International, and the BASIC programming language was developed at Dartmouth, simplifying human-computer interaction.
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The U.S. escalation of the Vietnam War primarily took place between 1964 and 1965. While the U.S. had provided military aid and advisors since the 1950s, a series of specific events transformed the conflict from a limited advisory role into a full-scale American war.
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The development of ARPANET and the subsequent World Wide Web transformed global communication and the information age
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A massive, coordinated surprise attack by North Vietnamese and Viet Cong forces across South Vietnam. While a military victory for the U.S., it was a strategic disaster that shattered American public support for the war.
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A B-52 crashed on the ice near a U.S. airbase. While the nuclear explosives did not detonate, the conventional explosives blew the bombs apart, spreading plutonium over a wide area.
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Vietnamization was President Richard Nixon’s 1969 strategy to end U.S. involvement in the Vietnam War by gradually withdrawing American troops and transferring combat roles to the South Vietnamese military. It aimed to train and equip South Vietnamese forces to fight on their own, allowing for an "honorable" American exit.
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Humans landed on the lunar surface for the first time during the Apollo 11 mission
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President Richard Nixon's visit to Beijing was a pivotal step in normalizing relations and reshaping the global balance of power.
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The SALT I treaty is signed, signaling a period of Détente (easing of tensions).
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Bill Gates and Paul Allen established the company that would dominate the personal computer software market
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A major diplomatic breakthrough brokered by President Jimmy Carter, leading to a peace treaty between Egypt and Israel.
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A training tape simulating a massive Soviet attack was accidentally loaded into the live U.S. early-warning system, leading to high-level alerts before the error was caught.
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The Soviet invasion of Afghanistan begins, ending the period of Détente and leading to a decade-long conflict.
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The Jarvik-7 was first implanted into a human patient at the University of Utah.
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The Soviets nearly launched a strike because they thought a NATO training exercise was a real attack.
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A Soviet early-warning satellite mistakenly reported five incoming U.S. missiles due to sunlight reflecting off clouds. Soviet officer Stanislav Petrov correctly identified it as a false alarm, disobeying orders to report it as an attack.
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Eliminated an entire class of intermediate-range missiles in Europe.
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The Soviet Union is formally dissolved, marking the official end of the Cold War.
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The North American Free Trade Agreement created one of the world's largest free trade zones between the U.S., Canada, and Mexico
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Russian President Boris Yeltsin actually activated his "nuclear briefcase" after a scientific research rocket was mistaken for a U.S. missile.
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The International Human Genome Project released a rough draft of the human genetic code, opening new doors for personalized medicine.
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Originally a university networking site, it catalyzed the global social media revolution.
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The collapse of the U.S. subprime mortgage market triggered the worst global economic downturn since the Great Depression.
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Apple's release of the first widely used touchscreen smartphone revolutionized personal technology and mobile internet access.
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A series of pro-democracy protests and uprisings across the Middle East and North Africa that led to the ousting of several long-standing dictators.
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U.S. Navy SEALs killed the al-Qaeda leader in Pakistan, nearly a decade after the 9/11 attacks
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Nearly 200 countries signed a landmark accord to reduce greenhouse gas emissions and combat global warming.
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Both events signaled a rise in populism and nationalism in Western democracies.
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The World Health Organization (WHO) signaled a global health crisis that led to lockdowns, an economic recession, and permanent shifts in remote work.
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The end of a 20-year military occupation coincided with the rapid return of the Taliban to power
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The largest conventional military conflict in Europe since World War II, causing a massive refugee crisis and global energy instability.
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The public launch of generative AI sparked a global "AI Boom," fundamentally changing how information is created and processed.
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A major attack on Israel led to a devastating conflict in Gaza, causing significant regional instability and a global humanitarian crisis.
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Despite rising emissions, 2024 saw record investments in solar power and electric vehicles as the world attempted to accelerate the energy transition
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