What was the main cause of 'Oregon Fever and the emigration of many Americans to
the Oregon Country, considered the Great
Migration?
A. The depression of 1837 and the rich farmland in Oregon
Country
B. The gold rush in the Oregon Country
C. Joint occupation between Great Britain and the U. S. of the
Oregon Country

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d

the western roman empire flourished, but the eastern portion of the empire struggled.