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1780s: Constitution of the United States of America (1787)
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1790s: Whiskey Rebellion (1794)
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1800s: Louisiana Purchase (1803)
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1810s: Battle of New Orleans (1815)
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1820s: Monroe Doctrine (1823)
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1830s: Era of the Common Man (1829–37)
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1840s: Treaty of Guadalupe Hidalgo (1848)
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1850s: Dred Scott Decision (1857)
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1860s: Battle of Gettysburg (1863)
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1870s: Battle of the Little Bighorn (1876)