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World War I was one of the great watersheds of 20th-century geopolitical history. It led to the fall of four great imperial dynasties (in Germany, Russia, Austria-Hungary, and Turkey), resulted in the Bolshevik Revolution in Russia, and, in its destabilization of European society, laid the groundwork for World War II.

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The Civil War is the central event in America's historical consciousness. ... Northern victory in the war preserved the United States as one nation and ended the institution of slavery that had divided the country from its beginning

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What was the impact of the Louisiana Purchase? The Louisiana Purchase eventually doubled the size of the United States, greatly strengthened the country materially and strategically, provided a powerful impetus to westward expansion, and confirmed the doctrine of implied powers of the federal Constitution.

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The Constitution of the United States established America's national government and fundamental laws, and guaranteed certain basic rights for its citizens. ... Under America's first governing document, the Articles of Confederation, the national government was weak and states operated like independent countries

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The Bill of Rights is the first 10 amendments to the United States Constitution. These amendments guarantee essential rights and civil liberties, such as the right to free speech and the right to bear arms, as well as reserving rights to the people and the states.

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The Declaration of Independence is an important part of American democracy because first it contains the ideals or goals of our nation. Second it contains the complaints of the colonists against the British king. Third, it contains the arguments the colonists used to explain why they wanted to be free of British rule