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 great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

the answer is d. give brainliest if right.

ps is this 7th grade civics?

a love letter < 3

explanation:

hi would love to but need a bit more info