The Mexican War
Lecture no. 35 from the course: A History of the United States, 2nd Edition
Taught by Professor Gary W. Gallagher and 2 others | 29 min | Categories: The Great Courses Plus Online History Courses
James K. Polk's election was the signal for the renewal of Jacksonian expansionism and the use of expansionism to serve the interests of slavery. Polk aggressively pushed American claims to territory along the southern border with Mexico and the Canadian border with Great Britain. The latter was resolved diplomatically; the former started war against Mexico. The United States gained all of what is now the American Southwest, from the Rio Grande River westward to the Pacific.