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The Cold War was a confrontation started at the end of World War II between the so-called Western bloc led by the United States and the Eastern bloc led by the Soviet Union.
Its origin is usually set in 1945, during post-war tensions, and continued until the dissolution of the Soviet Union. The reasons for this confrontation were essentially ideological and political.Neither bloc ever took direct action against the other, which is why it was called the Cold War.

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The September 11 attacks were a series of four coordinated terrorist attacks by the Islamic terrorist on the United States on the morning of Tuesday, September 11, 2001. The attacks killed 2,996 people and injured over 6,000 others, through the hijacking of commercial aircraft to be impacted, causing the destruction in New York of the Twin Towers and serious damages in the building of the Pentagon, headquarters of the Department of Defense in Washington D.C.

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During the first two decades after the Revolutionary War, there were dramatic changes in the status of slavery among the states and an increase in the number of freed blacks. Inspired by revolutionary ideals of the equality of men and influenced by their lesser economic reliance on slavery, northern states abolished slavery. The United States became the most important buyer of slaves to make agricultural labors. Slavery extended to the southern states that practiced mainly agriculture.

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The American Revolution was a political upheaval that took place between 1765 and 1783 during which colonists in the Thirteen American Colonies rejected the British monarchy and aristocracy, overthrew the authority of Great Britain, and founded the United States of America. The Continental Congress determined King George III's rule to be tyrannical and infringing the colonists' "rights as Englishmen", and declared the colonies free and independent states in July 4th 1776. The Patriot leadership professed the political philosophies of liberalism and republicanism to reject monarchy and aristocracy, and proclaimed that all men are created equal.

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The Civil War began on April 12, 1861, when confederate forces a U.S. military installation at Fort Sumter in South Carolina. In response to the attack, on April 15, Lincoln called on the states to send detachments totaling 75,000 troops to recapture forts, protect the capital, and "preserve the Union", which in his view still existed intact despite the actions of the seceding states. The two armies had their first major clash at the first battle of bull Red, ending in a Union defeat, but, more importantly, proved to both the Union and Confederacy that the war would be much longer and bloodier than originally anticipated.