FIRST ONE TO ANSWER MY QUESTION WILL GET BRAINLEST What did the U. S. (Texas) and Mexico not agree on that eventually led to the start of the war?

Causes of the Mexican-American War Texas gained its independence from Mexico in 1836. Initially, the United States declined to incorporate it into the union, largely because northern political interests were against the addition of a new slave state.

Explanation:

In 1846, a dispute over the border between Texas and Mexico resulted in armed conflict, and the Mexican–American War began. ... The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. All through the 19th century Americans believed it was their right to expand westward

Explanation:

answer: d. geography : )

the answer is option a.