Why did african americans begin to move to northern cities in the 1800?

How does wards description of the roman government compare to polybius description in sorce 1 and millars description in source 2

According to the lecture, which types of english vocabulary contributions are most often descended from latin?

Why was the united states motivated to establish the open door policy? a. the policy guaranteed american commerce with china. b. the policy supported the chinese nationalist cause. c. the policy led to a gain of american colonies in asia. d. the policy claimed damages from the chinese.