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The Declaration of Independence of thirteen British colonies in North America

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The Treaty of Paris of 1783
- territories were recognized by Great Britain.
- concluded the American Revolutionary War.
- doubled the size of the colonies, now able to stretch west past the Proclamation Line to the Mississippi River.

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Louisiana Purchase from France
- doubled the size of the United States
- greatly strengthened the country materially and strategically

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Florida Purchase Treaty
- officially transferred Florida to the United States after years of negotiations

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The Oregon Country was ceded.
-  access to the Pacific Ocean

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Texas Annexation
- contributed to the coming of the Mexican-American War (1846-1848).
- the Northern half of the Mexican territories to the US

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Mexican-American war
- Nevada, Utah, California, Arizona, part of Colorado, part of New Mexico

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Alaska
— was purchased from Russia in 1867

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1882_Map of Alaska and adjoining regions. Polar, Brown&Black Bear

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Hawaii
- culmination of the Pacific expansion
- 5 years prior to this the government was overthrown

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The Spanish-American war
- the US gained Guam, Puerto Rico, and the Philippines (became independent in 1946)
- the US occupied Cuba for several years

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American Samoa was acquired by the United States after the end of the Second Samoan Civil War

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Temporary acquisition of Panama Canal Zone (until 1999)

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Purchase of the Virgin Islands from Denmark