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The cotton gin is a device for removing the seeds from cotton fiber.
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The XYZ Affair was a political and diplomatic episode in 1797 and 1798.
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The Louisiana Purchase (1803) was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million.
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The Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty.
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The Missouri Compromise was an effort by Congress to defuse the sectional and political rivalries triggered by the request of Missouri late in 1819 for admission as a state in which slavery would be permitted.
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The Monroe Doctrine was a U.S. foreign policy regarding domination of the American continent in 1823.
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The Indian Removal Act was passed by Congress on May 28, 1830, during the presidency of Andrew Jackson.
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On February 23, 1836, the arrival of General Antonio López de Santa Anna's army outside San Antonio nearly caught them by surprise. Undaunted, the Texians and Tejanos prepared.
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During the Texas Revolution, a convention of American Texans meets at Washington-on-the-Brazos and declares the independence of Texas from Mexico.
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In 1838 and 1839, as part of Andrew Jackson's Indian removal policy, the Cherokee nation was forced to give up its lands east of the Mississippi River and to migrate to an area in present-day Oklahoma.
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The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845–1848.
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A war between the U.S. and Mexico spanned the period from spring 1846 to fall 1847. The war was initiated by Mexico and resulted in Mexico's defeat and the loss of approximately half of its national territory in the north.
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Why, that has to be the American-Canadian border between Lake of the Woods (Minnesota/Manitoba) and Boundary Bay (Washington State/British Columbia), which runs for 1,260 miles along the 49th parallel north.
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