1821 In December the first American settlers organized by Stephen Austin arrive in Texas, settling in what is now Brazoria County.Timeline State: TexasTimeline Country: United StatesTimeline Subjects: territorial expansionEra: 1801-1900 Read more about 1821
1819 Spain cedes Florida to the United States in the Adams-Onis Treaty signed in Washington, D.C. on February 22.Timeline State: FloridaTimeline Country: United StatesTimeline Subjects: territorial expansionEra: 1801-1900 Read more about 1819
1804 On May 14, the Lewis and Clark Expedition begins in St. Louis. The explorers return to St. Louis on September 23, 1806.Timeline State: N.A.Timeline Country: United StatesTimeline Subjects: territorial expansionEra: 1801-1900 Read more about 1804
1803 On April 30, the U.S. Congress approves the agreement that purchases Louisiana from France, nearly doubling the size of the nation.Timeline State: LouisianaTimeline Country: United StatesTimeline Subjects: territorial expansionEra: 1801-1900 Read more about 1803
1787 The Northwest Ordinance is enacted by Congress on July 13. It allows for the creation of future states and outlaws slavery in the Northwest Territory.Timeline State: N.A.Timeline Country: United StatesTimeline Subjects: territorial expansionEra: 1701-1800 Read more about 1787
