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Europe broke into war because of the growing conflict over power. The Allies - Russia, France, and Britain - fought the Central Power led by Germany. This was the beginning of World War I.

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U.S finally joined the War when German submarine sank the Lusitania ship that was carrying U.S passengers. The United States joined the Allies and helped them win the war.

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Germany signed the peace treaty, that they thought was unfair.

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The U.S stock market crashed, and that led to a worldwide economic downturn known as the Great Depression.

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Adolf Hitler rose to power in Germany. He promised to restore Germany's political and economical strength, and becomes a dictator, with the plan of conquering all of Europe.

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World War II starts when Hitler invades Poland.

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Japanese bombed Pearl Harbor, a U.S naval base in Hawaii. This event cause the U.S to join the war with Britain, France and the Soviet Union against the Axis Powers led by Germany, Italy, and Japan.

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Germany surrenders in May, 1945, but Japan fought on.
U.S drops atomic bombs in Hiroshima, on August 6th, and in Nagasaki, on August 9th, that destroyed the cities and killed thousands of civilians in Japan.
On September 2nd, 1945, Japan finally surrendered.

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The U.S and the Soviet Union were engaged in a Cold war, a long period of political tension without any fight. Even though they had been allies, they had political differences.

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The Cold war ended, because the government of the Soviet Union started to break apart.

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On September 9th, 2001, terrorists hijacked four U.S planes with passengers and crashed them into civilian and military targets, killing over 3000 people.
In October 7th, 2001, U.S invaded Afghanistan where the terrorist groups originated.

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U.S campaign to defeat terrorist led to an operation that ended in the death of Osama bin Laden, who was believed to have planed the 9/11 attack, in 2011.