Sato pointed to the Chinese massacre of 1871, when a mob in Los Angeles’ Chinatown attacked and murdered 19 Chinese residents, including a 15-year-old boy, a reflection of the growing anti-Asian sentiment that came to its climax with the Chinese Exclusion Act of 1882. The act banned the immigration of Chinese laborers, much as the Page Exclusion Act of 1875, the nation’s first restrictive immigration law, had prohibited the entry of Chinese women.
https://news.harvard.edu/gazette/story/2021/03/a-long-history-of-bigotry-against-asian-americans/