Paper sons were Chinese immigrants who used fraudulent documents to claim they were the sons of U.S. citizens, allowing them to circumvent restrictive immigration laws. This practice became prominent during the late 19th and early 20th centuries, particularly in the context of the Chinese Exclusion Act of 1882, which severely limited Chinese immigration. By creating false identities, these individuals could gain entry into the United States and establish a foothold in American society despite systemic barriers.