First Seminole War  The First Seminole War (1817–1818) began over attempts by U.S. authorities to recapture runaway black slaves living among Seminole bands.  Under General Andrew Jackson, U.S. military forces invaded the area, scattering the villagers, burning their towns, and seizing Spanish-held Pensacola and St. Marks.

Convention of 1818  The summary of the Convention of 1818 solved the boundary problems between the UK and the United States. It also allowed both nations to occupy the Oregon Country as well as to establish settlements.  The Convention of 1818 was also a major loss of territory for the UK in North America.

Monroe Doctrine  Proclamation in 1823 by President James Monroe. It warned European nations not to get involved in political matters in Central and South America. The Doctrine was intended to show that the United States was the only country that could influence such political matters. Further, several countries in South American had recently undergone revolutions against their European colonial owners and ended up with republican governments. The United States agreed with their political philosophy and did not want to see those newly free nations become European colonies again.

Florida Purchased from Spain  The Territory of Florida was an organized incorporated territory of the United States that existed from March 30, 1822, until March 3, 1845, when it was admitted to the Union as the State of Florida. Originally the Spanish territory of La Florida, and later the provinces of East and West Florida, it was ceded to the United States as part of the 1819 Adams-Onís Treaty.

Adams-Onis Treaty  The Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty or the Purchase of Florida or the Florida Treaty, was a treaty between the United States and Spain in 1819 that gave Florida to the U.S. and set out a boundary between the U.S. and New Spain (now Mexico). It settled a standing border dispute between the two countries and was considered a triumph of American diplomacy.

Missouri Compromise 1820  The Missouri Compromise was passed in 1820 between the pro-slavery and anti- slavery factions in the United States Congress, involving primarily the regulation of slavery in the western territories. It prohibited slavery in the former Louisiana Territory north of the parallel 36°30’ north except within the boundaries of the proposed state of Missouri.

“Era of Good Feeling”  Monroe embarks on a lengthy, sixteen-week tour of New England. In the absence of his major cabinet appointees, Monroe uses the tour to foster a sense of national unity through local political contact, public appearances, and private meetings with opposing Federalists. The tour gives birth to the designation of Monroe's administration as the “Era of Good Feelings.”