What was the reason for the Mexican-American war?

the main cause of the war was that the u.s wanted to expand westward

Explanation:

because of manifest destiny many americans thought their destiny was to expand westward

he armenian genocide, also known as the armenian holocaust, was the ottoman government's systematic extermination of 1.5 million armenians, mostly citizens within the ottoman empire.

explanation:

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;