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Territorial expansion happened as a result from war with Mexico and international disputes; treaties were made that required more land. The Manifest Destiny, a religious idea, helped increase the amount of land America would take into their own hands through westward expansion.
By 1820, the United States already extended well beyond its original boundaries. Through the Louisiana Purchase of 1803 and treaties with Spain and Britain, the nation’s borders moved west to the Rocky Mountains, north to the 49th parallel, and south to Florida and the Gulf of Mexico.
After the Spanish American War, Americans were convinced that Cubans could not govern themselves. The Platt Amendment was then used to allow the U.S. to basically completely control Cuba trade and government. The U.S. then used Cuba for economic purposes by dominating their various industries, imports, and exports.
Immigration to the USA: 1820-1860. In the first half of the 19th century the United States was predominantly an agricultural country. The main reason people decided to leave Europe during this period was the possibility of acquiring cheap or free land.
Nine years later, the United States annexed Texas and made it a state. The United States gained more Mexican territory as a result of the Mexican War (1846-1848), which was fought between the United States and Mexico over a number of disagreements, including territorial disputes.
As a result of this large-scale immigration, the population of the United States between 1830 and 1860 grew from 12,866,000 to 31,443,000.
Indian Treaties and the Removal Act of 1830. The U.S. Government used treaties as one means to displace Indians from their tribal lands, a mechanism that was strengthened with the Removal Act of 1830.