Franklin Delano Roosevelt’s Influence as president Some have called him the best president yet. Others have even claimed that he was the world's most influential and successful leader of the twentieth century. Those claims can be backed up by the overwhelming support that he received from his citizens throughout his four terms in office. President Franklin Delano Roosevelt began a new era in American history by ending the Great Depression that the country had fallen into in 1929. His social reforms gave people a new perspective on government ....