Einstein had signed a letter to President Franklin Delano Roosevelt, written by physicist Leo Szilard, that urged the development of a fission bomb in 1939.

Source: https://www.jta.org/2023/07/19/culture/the-jewish-story-behind-oppenheimer-explained

Long after President Franklin Delano Roosevelt confronted an environment in which a disability was regarded as an abnormal, pitiful condition, a struggle for disability rights led to the 1990 Americans with Disabilities Act.

Source: https://www.dailycamera.com/2023/09/02/community-editorial-board-accessing-disability-services-at-cu/

President Franklin Delano Roosevelt famously fished for marlin in the area in 1939 and reports at the time indicated he’d caught two in one weekend.

Source: https://www.bostonherald.com/2023/08/11/polygraphs-scales-and-big-big-fish-marylands-white-marlin-open-turns-50-with-a-record-10-5m-in-prizes/

Today, the only President to ever have the honor of serving four terms is Franklin Delano Roosevelt.

Source: https://www.cbr.com/best-alternate-history-films/