Respuesta :

Officially it was because of disputed territory in southern Texas and violence by Mexican troops on "American soil". 

Many people suspected however that this violence was provoked by Polk so that he could fight and win an easy war in order to gain lots of Western territory. 
It was seen by its critics as aggressive and so it was controversial.
chavahoffman

Answer:

it is C

Explanation:

In late April 1846, Mexican troops crossed the Rio Grande and killed eleven U.S. soldiers. In response, Polk requested a declaration of war from Congress, arguing that Mexicans had "shed the blood of our fellow-citizens on our own soil."  

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