1. why is the acquisition of the northwest territory in 1789 considered a turning point in american history? (ushc-2.1)
a. it served as the primary cause of the mexican-american war in 1848.
b. it angered both great britain and france and resulted in the war of 1812.
c. state governments claimed sole authority over the expansion of slavery in new territories.

d. the national government passed a law that banned the expansion of slavery for the first time.

Option A is the right answer.

Explanation:

The main impact of the acquisition of northwestern territory is that it served as a main cause of American Mexican war. America’s manifest destiny was achieved and rewarded by the war that was waged between America and Mexico.

United States desire to acquire the entire west, urged them to enter the territories of Texas which belonged to Mexico. This hostile invasion created apprehensions in Mexico and they feared of losing Texas.

This American Mexican war created border dispute between America and Mexico which resulted in cession of vast lands. It was an unreasonable conflict based on the Belief that America was provided with Divine right to expand in order to attain glory in the world (Manifest destiny).

d) all choices are correct

c. had saved colonel cresap's family from attack by other native americans.