The Chinese Exclusion Act was a law signed in 1882 that intended to stop the immigration of Chinese laborers also known as "coolies", in order to promote the hiring of American laborers and the payment of good salaries for employees. The Chinese Exclusion Act was also surrounded by a general dislike and racist thoughts towards Chinese population, and it had consequences in the Chinese immigrants who were already in the US because they could no longer become American citizens. Thus, the right answer is the option "The act blocked Chinese immigrants from becoming American citizens".