Europeans turned to africa as a source of enslaved persons because

there weren’t enough criminals and captives to do the work.
groups of american indians were exploited and decimated.
only africans were capable of doing the backbreaking work.
only africa could provide the number of workers needed.

"there weren’t enough criminals and captives to do the work." is wrong, because the European didn't enslave their criminals.

"only Africans were capable of doing the backbreaking work." there's nothing to prove that this was the case

"only Africa could provide the number of workers needed." this is also not the case. Since there were plenty natives.

The answer is:

"groups of American Indians were exploited and decimated."

In the end, the Africans did not die as much as the Indians. So the Europeans had a source, the slaves could handle the diseases and wouldn't die as much.

"groups of American Indians were exploited and decimated."

Explanation:

I got 100 on the quiz on ed

The Soviets refused to allow elections in Eastern European nations.

Explanation: When Roosevelt, Churchill, and Stalin, leaders of the World War II Allied nations, met at Yalta in 1945, there was a big push for Stalin to allow free elections to take place in the nations of Europe after the war. At that time Stalin agreed, but there was a strong feeling by the other leaders that he might renege on that promise. The Soviets never did allow those free elections to occur. Later, Winston Churchill wrote, "Our hopeful assumptions were soon to be falsified." Stalin and the Soviets felt they needed the Eastern European nations as satellites to protect their interests.