Mai Nuosen Act (Magnuson Act ) is 1943 by the Washington Senators Mai Nuosen proposal passed. The bill is from 1882 years after the Chinese Exclusion Act, the first Chinese immigrants allowed to go into Chinese in the United States and U.S. citizens; This is the " 1790 Year Naturalization Act , " one after the first Asian to be allowed to naturalization, but this bills are still not allowed to own property and commercial Chinese until Mai Nuosen Act itself was repealed so far.

1943 was the United States in the Second World War to become allies of the year, although relations between the two countries more friendly, but this Act restrictions on Chinese immigrants is particularly severe, a year limit is only 105 people, is said to be based on 1924 years immigration laws.

But the 1924 immigration law limits the number of years is based on 1890 years of living in the United States, the percentage of persons from that country to be, so calculation, 1,890 years Chinese-American has 10 Wan seven one thousand 488 people, so limit shall be 2150 Talent right.

Until " 1965 Immigration Immigration and Nationality Services Act , " a pass to race to the quota system was finally abolished; immigration bill to protect the spirit of family reunion and attract talented foreigners based.