Key Themes- United StatesDuring the Contemporary Era, the United States rose up to a global superpower. It began when the United States supplied the British with military power during WWI. After the war ended, the United States globalized, and grew internally, until it had one of the biggest armies in the world. This army was then put to use in the infamous WWII where atomic and nuclear warfare began. Since then the United States led the nuclear arms race, and faced off Cuba in the Cold War.
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