... because they opposed the United States becoming a member of the League of Nations.
The League of Nations was the signature idea of President Woodrow Wilson, point #14 of his 14 Points, an international peacekeeping association which he recommended for post-war settlements. The Treaty of Versailles adopted that idea, but back home in the United States, there was not support for involving America in any association that could diminish US sovereignty over its own affairs or involve the US again in wars beyond those pertinent to the United States' own national security.
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.
The second one “Federal authorities gradually shift power back to the states”
