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People started to move west because Jeferson gave the people that moved west free land. This caused railroads to be built, conflict with the native americans, the buffalo population declined rapidly and Daniel Boone found the Cumberland Gap.
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There was rapid economic growth, new products from industialisation aided the middle class and the rich played a real game of monopoly.
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The United States influenced the economy, military and social aspects of other countries.
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The United States went through a time of political reform and political activism.
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World War 1 was a global war that the United States got involved with in 1918.
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In the twenties culture and society changed dramatically, also prohibition was ended.
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The stock market crashed causing the economy to fall.
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Germany wanted to create a superior race, which in turn caused millions of deaths
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Political tension between Soviets and the United States.
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The movement for equality between races.
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The war against French colonists and Vietnam communist's in Vietnam. Protests began in the United States to pull troops out of Vietnam.
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There were technical improvements, the cold war ended and economy changes.
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There have been terrorist attacks, political tension, there was a black president elected in 2008 and technology improvements.
