The document summarizes the causes and results of the U.S.-Mexico War from 1846 to 1848. The war was caused by disputes over the border between Texas and Mexico after Texas gained independence, with the U.S. claiming the Rio Grande border and Mexico claiming the Nueces River. The U.S. also wanted to expand its territory westward. As a result, Mexico ceded over a third of its territory in the northern Mexican Cession to the U.S., giving up claims to modern day California, Arizona, Nevada, Utah, and parts of Colorado and New Mexico, in exchange for $15 million and debt forgiveness.

1. Conflict in the Age of Expansion
part II
The U.S. Mexico War 1846-1848

2. Causes of the War
• 1. Texas gains Independence from Mexico in
1836.-Texas Revolution
• 2. The U.S. agrees to annex or “take on” Texas in
1845.
• 3. The two countries disagree on where the
southern border of Texas is- Rio Grande River or
the Nueces River
• 4. Americans want Mexico’s land for different
reasons- to spread slavery into the West, to
expand U.S. territory across the continent.-
Manifest Destiny

3. Results of the War- The Treaty of Guadalupe
Hidalgo
• 1. Mexico agrees to give up its claims to 1/3 of
its territory in the North.- Mexican Cession
• 2. The U.S. buys the land for 15 million and
forgives 3 million in debt Mexico owes to U.S.
citizens.- we originally offered 50 million.
• 3. The U.S. gains California during the gold
rush.
• 4. The Gadsden Purchase- 10 mill for southern
Arizona for the railroad

11. Review Questions
• 1.What river did Mexico claim was the border?
What river did the U.S. claim was the border?
• 2. What did Polk do after Mexico rejected his
diplomatic offer?
• 3. Name at least one politician/official/public
person that opposed the war.
• 4. What was the Wilmot Proviso? Popular
sovereignty?