Roosevelt was inaugurated as the 32nd President of the United States. ... He immediately summoned the United States Congress into a three-month (nearly 100-day) special session, during which he presented and was able to rapidly get passed a series of 15 major bills designed to counter the effects of the Great Depression. I think The United States reelected FDR in 1940 for his third term, making him the only U.S. president to serve for more than two terms. ... He also initiated the development of the world's first atomic bomb, and worked with other Allied leaders to lay the groundwork for the United Nations and other post-war institutions.