The correct answer should be B. decreased immigration
Immigration was not decreased, it was high and therefore people needed more land and they expanded.
I think the answer is A. it prohibited slavery in the Northwest Territory
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Answer:
The most important reason is that the Communism meant the division of land, which until then was totally in the hands of rich Russian landowners.
Explanation:
Most people in Russia, especially peasants were poor. They had no belongings and had to work on the farms of Russian landowners. Communism offer them distribution of land and end of war, during which Russia suffered the most. That is why many people accepted to join the Red Army.
Erasmus wanted everyone to be able to read the Bible. His arguably greatest accomplishment was his translation of the New Testament. Erasmus wanted the Bible to be publically available in every language. A is the correct answer.
The answer to your question is the 3rd choice