Let's retrace on a map, the territorial evolution of the USA from its independence until today.
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1775-1783 The American Revolutionary War
1783 The Treaty of Paris
1803 The Louisiana Purchase
1810 Annexation of West Florida
1818 New Border with the UK along the 49th Parallel
1819 The Adams–Onís Treaty
1821 Independence of Mexico
1845 Annexation of Texas
1846 The Oregon Treaty, the Territory Is Shared with the UK
1848 The End of the Mexican-American War
1853 The Gadsden Purchase
1867 The Alaska Purchase
1898 Annexation of Hawaii
1898 The End of the Spanish-American War
1946 Independence of the Philippines