https://history.state.gov/milestones/1921-1936/immigration-act
https://www.whitehouse.gov/about-the-white-house/presidents/calvin-coolidge/
https://history.house.gov/Historical-Highlights/1901-1950/The-Immigration-Act-of-1924/
https://immigrationhistory.org/item/%E2%80%8B1921-emergency-quota-law/
https://www.statueofliberty.org/ellis-island/overview-history/
https://www.whitehouse.gov/about-the-white-house/presidents/calvin-coolidge/
https://history.house.gov/Historical-Highlights/1901-1950/The-Immigration-Act-of-1924/
https://immigrationhistory.org/item/%E2%80%8B1921-emergency-quota-law/
https://www.statueofliberty.org/ellis-island/overview-history/