In 1930s,100000 Americans applied to immigrate to the Soviet Union, mainly because of the economic depression and social unrest in the United States. ...

Analysis of test questions: In the 1930s, the United States had an economic crisis, which was very harmful, but the Soviet Union showed a scene of political stability and economic prosperity, so it chose ① ③; It is the economic crisis, not the huge population, that makes it difficult to survive. Exclude 2; Not only the United States was threatened by World War II, but also the Soviet Union was threatened by fascism.

Comments: In the 20th century, there were many models of modernization. The Soviet Union and Russia implemented a new economic policy and developed production by using the relationship between market and commodity currency. The United States implemented Roosevelt's New Deal and strengthened state intervention in the economy; China implemented reform and opening up and established a socialist market economic system. Capitalism and socialist modernization show the trend of mutual influence and reference.