Question

Why did President Polk declare war on Mexico?

Answer 1

there was a misunderstanding in the treaty settling the tex-mex border

Step-by-step explanation:

american soldiers were killed at the rio grande river because they thought that was the border. as opposed to the mexican soldiers that thought the border was the river nueces

Answer 2

On May 12, 1846, the United States Senate voted 40 to 2 to go to war with Mexico. President James K. Polk had accused Mexican troops of having attacked Americans on U.S. soil, north of the Rio Grande. But Mexico claimed this land as its own territory and accused the American military of having invaded.