The president who broke the two-term tradition by running for a third term in 1940 was Franklin Roosevelt. To get this answer, you can do a quick search using a search engine or visit a reliable historical website. Alternatively, you can consult history books or encyclopedias. In this case, a search engine would be a convenient option. Simply enter the question "Which president broke the two-term tradition by running for a third term in 1940?" in a search engine's search bar, and the answer should appear in the search results.
