1901 Vice President of the United States Theodore Roosevelt utters the famous phrase, "Speak softly and carry a big stick" at the Minnesota State Fair.
1901 President of the United States William McKinley dies after an assassination attempt on September 6, and is succeeded by Theodore Roosevelt.
1901 President Theodore Roosevelt officially renames the "Executive Mansion" to the White House.
1901 US President Theodore Roosevelt delivers a 20,000-word speech to the House of Representatives asking the Congress to curb the power of trusts "within reasonable limits".
1902 The U.S. Congress passes the Spooner Act, authorizing President Theodore Roosevelt to acquire rights from Colombia for the Panama Canal.
1902 Theodore Roosevelt becomes the first President of the United States to ride in an automobile.
1903 President Theodore Roosevelt sends a radio message to King Edward VII: the first transatlantic radio transmission originating in the United States.
1905 Russo-Japanese War: In New Hampshire, USA, the Treaty of Portsmouth, mediated by US President Theodore Roosevelt, ends the war.
1906 Theodore Roosevelt signs the Antiquities Act into law, authorizing the President to restrict the use of certain parcels of public land with historical or conservation value.
1906 U.S. President Theodore Roosevelt proclaims Devils Tower in Wyoming as the nation's first National Monument.
1906 Theodore Roosevelt is the first sitting President of the United States to make an official trip outside the country. He did so to inspect progress on the Panama Canal.
1906 U.S. President Theodore Roosevelt wins the Nobel Peace Prize, becoming the first American to win a Nobel Prize.
1909 Theodore Roosevelt leaves New York for a post-presidency safari in Africa. The trip is sponsored by the Smithsonian Institution and National Geographic Society.
1910 Theodore Roosevelt made his The Man in the Arena speech.
1910 Former President Theodore Roosevelt becomes the first U.S. president to fly in an airplane. He flew for four minutes with Arch Hoxsey in a plane built by the Wright Brothers at Kinloch Field (Lambert-St. Louis International Airport), St. Louis, Missouri.
1912 While campaigning in Milwaukee, Wisconsin, the former President of the United States, Theodore Roosevelt, is shot and mildly wounded by John Schrank, who was angry with Roosevelt for some reason. With the fresh wound in his chest, and the bullet still within it, Mr. Roosevelt still carries out his scheduled public speech.
2001 US President Bill Clinton awards former President Theodore Roosevelt a posthumous Medal of Honor for his service in the Spanish-American War.