Westward Expansion, 1840-1848

Attack on Emigrant Train by Charles Wimar (1856)
Although Indian attacks on Western emigrants were rare, this image was so powerful
that it influenced portrayals of Indians in Western movies made by
Hollywood more than a century later.
The Spanish mission system
Mexico seeks to strengthen
northern regions
In Texas, Mexican government gives
land grants to American settlers
Those who opposed
Texas annexation
(largely because they
opposed slavery)
Those who favored
(southerners and those
who favored slavery)