What has been a serious cause of division among the nations of Eastern Europe?

Choose all that apply.

ethnicity
economics
religion
politics

The answers you want to select are "ethnicity" and "religion"

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer