The double date discovered on a document written in 1905 reveals the history of our calendar system.
This week the Theodore Roosevelt Center presents a live interactive visit with the 26th president as part of the Presidential Primary Sources Project.
Theodore Roosevelt's correspondence details a Thanksgiving celebration in the White House.
Theodore Roosevelt was a noted naturalist and conservationist. As such, he has been memorialized through the naming of several species of animals.
Progressivism meant different things to different people throughout the Progressive Era. Theodore Roosevelt's definition was clarified in a speech that he gave in Louisville, Kentucky, on April 3, 1912.