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Principle of the U.S. policy by James Monroe in 1823 that any intervention by any external powers in the politics of the Americas is a potentially hostile act against the U.S.
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Purchase of Alaska to expand the U.S. for potential resources
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William Mckinley increased tariffs on manufctured goods to as high as 49%.
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boundary dispute between Venezuela and great Britain ended bringing Britain and the United States to the brink of war.
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A war between Spain and the U.S. following the sinking of the American Battleship Maine in the Havana harbor on February 15, 1898
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Hawaii was initially reconstituted as an independent republic, but the goal was annexation of Hawaii to the U.S.
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This ended the Spanish-American War and made Cuba a independent country and later became a U.S. protectorate and Puerto Rico became a U.S. protectorate and other countries got free from Spain.
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This added the Philippines as a US territory. This provided more resources for the economy and helped with trade.
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The U.S. used it's financial power to extend international influence.