Phoenix, Arizona supplied both water and electricity, becoming the first multi-purpose dam, and Roosevelt himself attended the official dedication on May 18, 1911. At the time, it was the largest masonry dam in the world, forming a lake in the mountain east of Phoenix. The dam would be renamed after Teddy Roosevelt in 1917, and the lake would follow suit in 1959. On February 14, 1912, Phoenix became a state capital, as Arizona was admitted to the Union as the 48th state under President William Howard Taft. This occurred just six months after Taft had vetoed a joint congressional resolution granting statehood
Admission to the Union federal properties within the state border or tax non-residents at a rate higher than residents, and would have a republican form of government, and also after reaching a population equal to that of the least-populated of the established states, it would be admitted, on an equal footing with all other states, based on a majority vote in Congress. Jefferson's original draft of the ordinance gave names to the proposed states, and also contained a provision that "After the year 1800 there shall be neither slavery nor involuntary servitude in any of them." The 1784 ordinance was superseded three years later