Question

Which of the following contributed to the beginning of the Mexican War?
A.
Mexico attacked American troops in Oregon.
B.
Mexico attacked American troops in California.
C.
President Polk wanted to annex Oregon.
D.
President Polk wanted to annex Texas.

Answer 1

D. President Polk wanted to annex Texas — the U.S. annexation of Texas and the disputed Texas–Mexico border (Rio Grande vs. Nueces River) were the main causes that led to the Mexican–American War.