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The development of the first atomic bomb is signed into agreement by Winston Churchill, the Prime Minister of Great Britain, and President Franklin D. Roosevelt.
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The Jefferson Memorial in Washington, D.C. was dedicated on the 200th anniversary of Thomas Jefferson's birthday by President Franklin D. Roosevelt.
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Harry S. Truman won the presidential election and became the 33rd president of the United States.
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The U.S. Senate approves the entry of the United States into the United Nations.
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President Harry Truman signs the Marshall Plan, which authorizes $15 billion in aid for 16 countries.
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Ralph Bunche was the first African American to be awarded the Peace Prize. He received it for having arranged a cease-fire between Israelis and Arabs during the war which followed the creation of the state of Israel.
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President Harry S. Truman orders the development of the hydrogen bomb, in response to the detonation of the Soviet Union's first atomic bomb in 1949.
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The 22nd Amendment was passed by Congress which limited Presidents to two terms.
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Dwight D. Eisenhower won the presidential election and became the 34th president of the United States.
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Disneyland was the first of two theme parks built at the Disneyland Resort in Anaheim, California.
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Public opinion of organized labor began to decline as evidence surfaced of corruption. The Landrum-Griffin Act responded by curbing the power of union officials.
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The 23rd Amendment allows American citizens residing in the District of Columbia to vote for presidential electors, who in turn vote in the Electoral College for President and Vice President
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John F. Kennedy won the presidential election and became the 35th president of the United States.
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In order to stimulate international trade, President Kennedy lowered the American protective tariff.
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President Kennedy was assassinated by Lee Harvey Oswald. Lyndon Johnson was immediately sworn into the presidency.
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The 24th Amendment abolished the use of a poll tax in national votes. From 1964 onward, black communities would not be subjected to poll taxes during elections.
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Neil Armstrong was an American astronaut and the first person to walk on the moon.
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The Public Health Cigarette Smoking Act was passed by Congress. It extends public health protection with respect to cigarette smoking and for other purposes.
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By the end of 1975, the North Vietnamese had resumed their invasion and rapidly taken South Vietnam. Over 500,000 South Vietnamese fled Vietnam to escape the communists.
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John Lennon, a member of the Beatles, was assassinated in New York City by Mark David Chapman killed him.
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The bombing of the Beruit barracks marked the end of peacekeeping operations in Lebanon.
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The Tax Reform Act simplified the tax code and broadened the tax base. It was referred to as "Reagan tax cuts".
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George H.W. Bush won the presidential election and became the 41st president of the United States.
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The Cold War officially ends when the USSR is dissolved.
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The 27th Amendment prohibits changes in Congressional salaries to take effect until after the next election cycle. It was first proposed in 1789.
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Bill Clinton won the presidential election and became the 42nd president of the United States.
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The Oklahoma City Bombing was an attack on the Alfred P. Murrah Federal Building in Oklahoma City. 168 people were killed including 19 children under the age of 6.