Why didn't everyone immigrate to the United States when the Soviet Union was as powerful as the United States?

At the beginning of the first five-year plan of the Soviet Union, an unprecedented economic crisis broke out in human history. A serious economic crisis broke out in the capitalist world from 1929 to 10. It quickly spread from the United States to the whole world and attacked almost all capitalist countries. The Great Crisis brought great disasters to the capitalist world, but it provided favorable opportunities for the development of Soviet industrialization. The Soviet Union took advantage of the urgent need of the West to export capital and technology abroad to find a way out of the crisis, introduced a large number of advanced western technologies, technicians and funds, and established a large number of key enterprises in major industrial sectors, which made the socialist industrialization of the Soviet Union develop to a new stage. At this time, European and American capital, technology and talents began to transfer to the Soviet Union to find a way out. The United States, the world's largest immigrant country, also showed an immigration tendency for the first time, with 654.38+million American skilled workers and engineers applying to immigrate to the Soviet Union. The Togorsk Iron and Steel Plant in Magney of the Soviet Union was designed based on the Gri Plant of the American Iron and Steel Company, the largest iron and steel complex in the world at that time. The largest Dnieper hydropower station in the Soviet Union was built by 1933 with American technical equipment and American technical experts. The famous Gorky Automobile Factory is a new factory aided by Ford Motor Company of the United States in the early 1930s. Stalingrad tractor factory was built in the United States, then dismantled and shipped to the Soviet Union. The equipment of Kharkov tractor factory is made in Germany and America, and the American is the chief construction engineer. In terms of aircraft and engine production, the United States supplies Soviet aircraft or aircraft parts and gives technical assistance. 193 1 year, machinery and equipment purchased by the Soviet Union accounted for about13 of the world's total machinery and equipment exports, which increased by about 50% in 1932.