Why did President Polk declare war on Mexico?

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

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

there are no mutiple choices here

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.