Seventeenth Amendment to the United States Constitution in 1907, when admitted, and once in 1908. In 1912, Oklahoma reelected Robert Owen by advisory popular vote. Oregon held primaries in 1908 in which the parties would run candidates for that position, and the state legislature pledged to choose the winner as the new Senator. New Mexico, admitted to statehood in 1912, chose only its first two Senators legislatively. Arizona, admitted to statehood in 1912, chose its first two Senators by advisory popular vote. Alaska, and Hawaii, admitted to statehood in 1959, have never chosen a U.S. Senator legislatively. The first direct elections to the Senate following the Seventeenth
Admission to the Union several states into the Union has been delayed due to complicating factors. Among them, Michigan Territory, which petitioned Congress for statehood in 1835, was not admitted to the Union until 1837, due to a boundary dispute with the adjoining state of Ohio. The Republic of Texas requested annexation to the United States in 1837, but fears about potential conflict with Mexico delayed the admission of Texas for nine years. Also, statehood for Kansas Territory was held up for several years (1854–61) due to a series of internal violent conflicts involving anti-slavery and pro-slavery factions. Once established, most state borders have,