The Causes and Effects of the Mexican War

Causes

1. Texan Annexation. Mexico had warned it would regard annexation as an act of war. When it took place, Mexico did not declare war, but broke diplomatic relations.
2. The Boundary Dispute. Regardless of its status (was it an American state or a rebellious Mexican province?), the United States maintained that the southern border of Texas was formed by the Rio Grande, but Mexico argued that the traditional boundary was at the Nueces River farther north.
3. Monetary Claims against Mexico. The United States had extracted a promise from the Mexican government to pay $3 million to cover the claims of American citizens who had lost property during turmoil and revolution. Mexico defaulted on those payments and the American creditors pressed their government for action.

Effects



1.The United States got territorial gains on their behalf due to the Treaty of Guadalupe Hidalgo.

2. They got an internal conflict over slavery.

3. The downfall of the Mexican government.