Which president proposed the League of Nations after World War I?

Which Union general became the 18th President? Which president led the "Rough Riders" during the Spanish-American War before becoming president? Which president is the teddy bear named after? Which president championed the building of the Panama Canal? Which president's administration was hit by the Teapot Dome scandal? Which president was in office when the stock market crashed in 1929? Which president launched the New Deal? Which president called December 7, 1941 "a date which will live in infamy"?