The United States vastly expanded its territory in the 1840s. In this Opening Up the Textbook (OUT) lesson, students examine a present-day textbook passage and four nineteenth-century sources to explore what motivated American territorial expansion at the time.
[Teacher Materials, Student Materials and PowerPoint updated on 04/23/2021.]
Image: American Progress, originally painted by John Gast in 1872. Cromolithograpgh published by George A. Croffut in 1873. From the Library of Congress.