1911 United States House of Representatives election in Arizona clause for admitting Arizona Territory and New Mexico Territory as a single state, but that clause was removed in the final version. Arizona was the last territory in the contiguous United States, and after Arizona's admission, it would be another 47 years before another State (Alaska) was admitted. 1911 United States House of Representatives election in Arizona Arizona's first election to the United States House of Representatives was held December 11, 1911, for the 62nd Congress Arizona joined the union as the 48th state on February 14, 1912, having already elected its first Representative in December. Arizona Territory had been
Admission to the Union Admission to the Union The Admission to the Union Clause of the United States Constitution, often called the New States Clause, found at Article IV, Section 3, , authorizes the Congress to admit new states into the United States beyond the thirteen already in existence at the time the Constitution went into effect. The Constitution went into effect on June 21, 1788, after ratification by 9 of the 13 states, and the federal government began operations under it on March 4, 1789. Since then, 37 additional states have been admitted into the Union. Each new state has been admitted on