The purpose of my paper is to consider a set of policies concerning flows adjustment and naturalization of inmigrants. The starting point of my analysis is the Naturalization Act of 1790, the first inmigration law of US government, which inspires the subsequent ones. I have conduced a more detailed investigation into federal measures since 1882, the year of Chinese Exclusion Act, passing through the legislation of the period between 1920 and 1930, influenced by a marked protectionism, to arrive to the acts of 1965, which dismantled the system of national quotas. The goal of my work is to highlight the relationship between the laws and the debated that has been created around them, which involves congress, public opinion, trade unions and asociations.


Keywords: Immigration; Naturalization; Nativism; Interests; Legislation.