Washington's two-term limit became the unwritten rule for all Presidents until 1940. In 1940, President Franklin Delano Roosevelt won a third term. ... Roosevelt was the first and only President to serve more than two terms. The amendment was passed by Congress in 1947, and was ratified by the states on February 27, 1951.
Tensions were very high during that time period. so many alliacnces were made as well as rivalries. it was a "powder keg" and when he was killed the keg exploded