Roosevelt, Frank ‧ lin D. /ˈfræŋklən diː, ˈfræŋklɪn diː/ BrE AmE
(1882–1945) a US politician in the ↑ Democratic Party , also known as FDR, who was the President of the US from 1933 to 1945. He helped to end the ↑ Great Depression by starting a programme of social and economic changes called the ↑ New Deal . He also tried to give support to the ↑ Allies without getting the US involved in World War II, but when Japan attacked the US in 1941 he was forced to join the war.