How did the northwest territories become part of the united states

Oregon was a vast territory first explored by the Spanish and the French in the 17th and 18th centuries. In the 1830s, American pioneers traveled along the Oregon trail; joint settlement by British and Americans started. In 1846, a formal border with the British territories was fixed at the 49 parallel. Oregon was formally admitted into the Union in 1859.

Explanation:

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.

d) he bring down boss tweed and tammany hall.