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 an equal footing with those already in existence. Of the 37 states admitted to the Union by Congress, all but six have been established within an existing U.S. organized incorporated territory. A state so created might encompass all or a portion of a territory. When the people of a territory or a region thereof would make their desire for statehood known to the federal government, in most cases Congress passed an enabling act authorizing the people of that territory or region to frame a proposed state constitution as a step toward admission to the Union. Although the use of an