Roosevelt’s early political career was curtailed by his contraction of polio in 1921; in spite of the disease, he resumed public life in a wheelchair in 1928 and received the Democratic presidential nomination in 1932. His New Deal package of economic measures (1933) helped to lift the USA out of the Great Depression, and after the American entry into World War II he played an important part in the coordination of the Allied war effort. In 1940 Roosevelt became the first US President to be elected for a third term in office, and he subsequently secured a fourth term. He was the joint author, with Winston Churchill, of the Atlantic Charter (1941), a declaration of eight common principles in international relations that was intended to guide a postwar peace settlement.