<span>The answer is "All of the Above"!</span>
The Cold War caused a lot of tension between the 2 countries and that was caused just by the fact that Russia was left out of the treaty after ww1. That and they had tension during the 1920s because Russia had turned to communism and us was afraid it was going to happen to them.
Not sure if i’m answering this question correctly but african slaves started being used because native americans were dying quickly due to disease
A. overpopulation
b. underpopulation
c. migration
d. urbanization
e. unsustainable development
f. sustainable development
g. emigration
h. immigration
The answer is a difference in temperature