1952 American immigration law, 1965 immigration law and 1990 immigration law were successively promulgated, which laid the foundation for its talent strategy. These three immigration laws set immigration quotas for all kinds of technical talents who are in urgent need, highly educated and outstanding in the United States, set priority levels for all immigrants, ensure the quality of immigrants in a targeted manner, and meet the objective needs of the market. In the process of implementation, the US government has also formulated a series of supporting measures, such as scientific research funds and special fund management system, to attract foreign talents with various preferential conditions and means. On the stage of international talent competition, the United States is the most prominent country in the world that benefits from the flow of talent capital. Relying on its own development advantages, it provides world-class scientific research conditions and high salaries, attracts high-level talents from all countries to immigrate or work in the United States, and becomes the largest talent inflow country and immigrant beneficiary country. America's high-tech industry has always benefited from foreign talents. Since 1980s, about 3,000 high-tech companies have been established in Silicon Valley, California, 30% of which were founded by immigrants of Indian and China descent. In 2000, foreign immigrant companies in Silicon Valley created sales wealth of $65.438+09.5 billion and created more than 70,000 jobs. Take MIT as an example, about 40% of its graduate students come from overseas. Among the people who won the Nobel Prize in Physics and Chemistry, half of the Americans are immigrants. This has had a very far-reaching impact on improving the comprehensive national strength of the United States, especially in the fields of science and technology, economy and military affairs. According to American calculation, it costs 50,000 dollars to train an expert, while the annual salary is only needed to introduce an expert, thus saving 50,000 dollars in education funds. During the period of 1996- 1998, the United States * * imported 240,000 experts, saving $654.38+02 billion in education funds, and these experts later created tens of billions of dollars of wealth for the American economy. In the 10 year in the 1990s alone, the United States added trillions of dollars in wealth. From 1996 to 2000, information technology promoted 28% economic growth in the United States. Advanced medical technology and services alone have brought a net growth of $2.4 trillion to the US economy. The United States has benefited a lot from this talent flow. The expansion of human capital and Matthew effect make its economy develop faster, thus attracting more international talents. In early February 2006, President Bush made a special trip to high-tech companies in Silicon Valley to deliver a speech, expressing the hope that Congress would increase the number of work visas for high-tech talents. He also said that the United States needs more engineers and physical scientists, and it would be a mistake not to encourage more really smart and outstanding talents that the United States cannot provide. In May, the Senate passed the immigration bill, and its important provisions included an increase of110.5 million H- 1B temporary work visas and an increase of 290,000 green card places. At the same time, it was decided to exempt all foreign students with advanced (master's or above) education in science, technology, engineering and mathematics from the restrictions of temporary work visas and green card quotas. As long as these international students are willing to stay in the United States after graduation, they can quickly acquire American citizenship. This immigration law is the first important immigration law passed by the United States in the 2 1 century, which further establishes the competitive advantage of talents in the United States and has far-reaching significance for the long-term development of the US government.

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