While immigrants to the United States from European nations during the period before the McCarran–Walter Act of 1952 were able to immigrate legally if with relative levels of ease depending on country of origin, the Chinese Exclusion Act of 1882 barred almost all Chinese from immigrating to the United States. Nonetheless, many Chinese immigrants arrived in America by obtaining false documents. The Chinese Exclusion Act allowed the Chinese Americans already settled in the United States to stay and provided for limited numbers of family members of Chinese Americans to immigrate with the correct paperwork. This loophole and the fateful 1906 earthquake that destroyed San Francisco's public records provided Chinese immigrants, almost entirely men, with the potential to immigrate with false documents stating their familial relationship to a Chinese American. These Chinese immigrants were called “paper sons,” because of their false papers. “Paper sons” relied on networks built by chain migration to buy documentation, develop strategies for convincing authorities on Angel Island of their legal status, and for starting a life in America.