The Changing Boundaries of the United States

Essential Question

How and where did American borders expand?

The Changing Boundaries of the United States

The United States in 1817

  1. Acquired from England by the Treaty of Paris at the end of the American Revolution

  2. Louisiana Purchase (1803) purchased from France that doubled the size of the United States

The United States in 1821

  1. The U.S. eventually forced Spain to part with Florida in 1819. Formal U.S. occupation began in 1821, was organized as a U.S. territory in 1822, and was admitted into the Union in 1845.

The United States in 1846

  1. After the Texas Revolution in 1845, the United States annexed (captured) Texas, which had been part of Mexico

  2. Treaties with Britain in 1818 and 1842 filled in other very small portions of the United States along the northern border.

The United States in 1848-1849

  1. The United States acquired the Oregon Territory from England in 1846 through negotiations

  2. Acquired by conquest in 1848 from Mexico at the end of the Mexican-American War

The United States in 1853

  1. Gadsden Purchase (1853) was a purchase from Mexico in 1853 completed the mainland United States

Discussion Questions

  • America expanded through treaties and conquest. Which contributed more to the growth of the United States?

  • What might be some effects of America's changing borders?

Activity 1: What were the main events that changed the boundaries of the United States?

Using the information from this lesson, answer the questions in a thinking map. Complete this assignment digitally or on paper. It will be collected in your portfolio.

Extension Activity

170 Years of America’s Evolution In One Animated GIF