20th century By hankkennedy Jan 1, 1900 U.S. population exceeds 75 Sep 14, 1901 William Mckinley assasinated Sep 14, 1901 Theodore Roosevelt becomes president Jan 1, 1903 Big Stick Diplomacy Feb 14, 1903 Department of commerce and Labor created Jun 14, 1903 Ford Motor Company formed Dec 17, 1903 The Wright brothers make their first powered flight in the Wright Flyer May 4, 1904 Panama Canal Zone acquired Jan 13, 1906 Susan B. Anthony dies Nov 6, 1907 Coal mine explodes in Monongah, West Virginia, killing at least 361. Nov 16, 1907 Oklahoma becomes a state Oct 1, 1908 Ford Model T appears on market Jan 1, 1909 The U.S. penny is changed to the Abraham Lincoln design Feb 12, 1909 NAACP founded by W. E. B. Du Bois Mar 4, 1909 William Howard Taft becomes President