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Austria-Hungary declares war on Serbia.
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Germany declares war on Russia
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Germany declares war on France.
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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Austria-Hungary declares war on Russia and Serbia declares war on Germany.
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U.S. President Woodrow Wilson announces the U.S. will remain neutral.
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The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in.
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The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
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The unofficial Christmas truce is declared.
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Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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Congress ratifies the Eighteenth Amendment, prohibiting the sale of alcohol anywhere in the United States
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Charismatic black nationalist leader Marcus Garvey, a Jamaican immigrant, convenes the first International Convention of the Negro Peoples of the World in New York's Madison Square Garden.
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The Nineteenth Amendment is ratified, granting women the right to vote.
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Baseball's World Series is broadcast on radio for the first time; the New York Giants defeat the New York Yankees, five games to three.
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The Sacco-Vanzetti trial begins; immigrant Italian radicals Nicola Sacco and Bartolomeo Vanzetti will eventually be convicted of murder and executed
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President Warren G. Harding dies of stroke in a San Francisco hotel room. Vice President Calvin Coolidge ascends to presidency.
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The market capitalization of Ford Motor Company exceeds $1 billion.
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F. Scott Fitzgerald publishes The Great Gatsby.
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Tennessee schoolteacher John Scopes is arrested for teaching evolution, in violation of new state law banning the teaching of Darwin. The ensuing "Scopes Monkey Trial," pitting defense attorney Clarence Darrow against three-time presidential candidate William Jennings Bryan in a proxy debate of modernity versus fundamentalism, captivates the nation. Scopes is eventually found guilty
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New York Yankees star Babe Ruth hits his 60th home run of the season, breaking his own record of 59. Ruth's record will stand for more than thirty years.
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The London Naval Reduction Treaty is signed into law by the United States, Great Britain, Italy, France, and Japan, to take effect on January 1, 1931. It would expire on December 31, 1936.
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The Smoot-Hawley Tariff Act is signed by President Herbert Hoover. Its effective rate hikes would slash world trade.
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Italy declares war on Britain and France.
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Hitler's forces attacked France, conquering the Luxembourg, Netherlands and Belgium in the process
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FDR elected to an unprecedented third term as president
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Breaks non-aggression pact with Stalin and invades the Soviet Union.
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All Jews are ordered to wear the Star of David, seperating them from the rest of the nation.
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Hitler declares war with the United States
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Japanese bomb the United States fleet at Pearl Harbor and Britain and the United States declare war on Japan
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the Battle of Stalingrad was a battle of World War II between Nazi Germany and its allies and the Soviet Union for control of the city of Stalingrad in southwestern Russia
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Italy forms armistice with Allies.
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Italy declares war on Germany
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US will not recognize communism
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truman demands Russia withdraw from Iran
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Truman announces truman doctrine
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Communists overthrow the government of Eduard Beneš
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The NATO treaty is signed.
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Germany divided into east and west
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Mao Zedong gains power.
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United States creates the hydrogen bomb.
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North Korea invades South Korea
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Dwight Eisenhower is inaugurated President.
