Job Recruitment Website - Ranking of immigration countries - Why is it that "from 1846 to18759 million people left Europe, and most of them went to the United States" because "the American government encourages immigration"?

Why is it that "from 1846 to18759 million people left Europe, and most of them went to the United States" because "the American government encourages immigration"?

No, the real reason is the industrial revolution. The second industrial revolution greatly improved the medical level and living standard, the birth rate greatly increased, and the mortality rate greatly decreased. Population explosion, tight employment and high unemployment rate. At that time, Asia, Africa and Latin America were all colonies, and the United States was not only independent, but also developed rapidly, requiring a large number of free labor, so most Europeans chose to go to the United States for development.