AP US History A: Unit 6 Lecture 3

To help AP US HISTORY A students prepare for their assignments and assessments, this lectue will review the following topics from the America Past and Present text: John Tyler, Polk, San Jacino, Gadsden Purchase, Mexican American War, railroads and canals, great inovations of the nineteenth century, The Treaty of Guadalupe Hidalgo, Webster Ashburton Treaty, medicine in the 1800s.