On December 8, 1941, the day after the Japanese attack on Pearl Harbor, President Franklin Delano Roosevelt delivered his famous “Day Of Infamy Speech." The United States had entered World War II. That evening, his wife would call on all Americans to focus on the war effort and to support the nation’s leaders in the difficult days ahead. She had also entered the war.

On Today's episode of America's National Parks, Eleanor Roosevelt—the only first lady to have a National Park Service Unit in her honor—and her critical role in World War II.