Established by an act of Congress passed on May 2, 1890, the Oklahoma Territory was formed from unassigned lands in the center of Indian Territory. Between 1890 and 1906, the area was enlarged by the addition of certain lands previously included in Indian Territory. Under terms of an enabling act approved June 16, 1906, Oklahoma and Indian Territory were joined to form the State of Oklahoma, which was admitted to the Union by presidential proclamation on November 16, 1907. Until it was merged with indian Territory and accorded statehood, the area known as Oklahoma Territory was administered by several officials, including Territorial Governors appointed by the President. Between 1890 and 1907, the following persons serves as Territorial Governors: George Washington Steele (1890-1891), Robert Martin (1891-1892), Abraham Jefferson Seay (1892-1893), William Miller Jenkins (1901), William C. Grimes (1901), Thompson Benton Ferguson (1901-1906), and Frank Frantz (1906-1907).