Northwest Ordinance - Established procedures for allowing new states to enter the Union , Louisiana Purchase - Land obtained from France by Thomas Jefferson in 1803, Manifest Destiny - The belief that the United States should rightfully possess North America from one sea to the other, Annexation of Texas - The political union of the Lone Star State and the US, U.S.-Mexican War - Began with a dispute about the border of Texas and ended with the Treaty of Gudalupe Hidalgo, Oregon Trail - The 2000-mile route used by pioneers stretching westward from the Great Plains and over the Rocky Mountains, Gadsden Purchase - The territory gained from Mexico that provided a southern route for the railroad , Urbanization - A trend that saw increased numbers of people moving to the cities, Great Plains - The broad expanse of flat land between the Mississippi River and the Rocky Mountains., Industrialization - The use of machines and technology to do work cheaply and more efficiently,

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