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1752 - The Liberty Bell is cracked when it is first rung in testing. It was fixed by 1753.
1770 - The Boston Massacre occurs. -
following the American Civil War, marked a significant chapter in the history of civil rights in the United States.
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was an era that occurred during the late 19th century,he Gilded Age was an era of rapid economic growth, especially in the Northern United States and the Western United States.
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was a period of widespread social activism and political reform across the United States of America that spanned the 1890s to the 1920s.
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a policy of extending a country's power and influence through diplomacy or military force.
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World War I was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918
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was a decade of economic growth and widespread prosperity, driven by recovery from wartime devastation and deferred spending, a boom in construction, and the rapid growth of consumer goods such as automobiles and electricity in North America and Europe and a few other developed countries
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It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors
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also known as the Second World War, was a global war that lasted from 1939 to 1945. It involved the vast majority of the world's countries
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he first military action of the Cold War began when the Soviet-backed North Korean People's Army invaded its pro-Western neighbor to the south. Many American officials feared this was the first step in a communist campaign to take over the world and deemed that nonintervention was not an option.
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The Civil Rights Movement in the United States was a decades-long struggle by African Americans and their like-minded allies to end institutionalized racial discrimination, disenfranchisement and racial segregation in the United States
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The Vietnam War, also known as the Second Indochina War, and in Vietnam as the Resistance War Against America or simply the American War, was a conflict in Vietnam, Laos, and Cambodia
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he Berlin Wall came down, borders opened, and free elections ousted Communist regimes everywhere in eastern Europe. In late 1991 the Soviet Union itself dissolved into its component republics. With stunning speed, the Iron Curtain was lifted and the Cold War came to an end.
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the 21st century is the current century of the Anno Domini era or Common Era,