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The 13 colonies declare their independence from Britain. The declaration of independence is adopted two days later.
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President James monrone declare that European powers can not colonize North and South America. These are American affairs.
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Open Door policy for equal trading rights inside China; promoted by U.S. and accepted by Britain, Germany, France, Italy, Russia and Japan
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Theodore Roosevelt refers to U.S. policy as "speaking softly and carrying a big stick", applied the same year by assisting Panama's independence movement from Colombia. U.S. forces sought to protect American interests and lives.
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Franklin D. Roosevelt declares the "Good Neighbour Policy", U.S. opposition to armed intervention in inter-American affairs.
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the period of tension and hostility between Soviet bloc and US/West Europe/Japans
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President Reagan gives the "Tear down this wall!" speech in Berlin, saying "Mr. Gorbachev, tear down this wall!". Reagan argues that tearing the Berlin Wall would be a symbol of Soviet good faith to prove Gorbachev was sincere in seeking better relations with the West.
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After the 9/11 attacts, U.S. and NATO forces invade Afghanistan and overthrow the Taliban
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Hillary Clinton enphasizes the importance of Asia and annnouces that the US will pivot their attention to Asia.
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Russia occupies Crimea illegally and the US uses economic sanctions againest them.