Arizona Territory 1877. The capital was finally moved to Phoenix on February 4, 1889. The territory was admitted to the Union as the 48th state on February 14, 1912. Proclamation to the People of Arizona. Arizona Territory The Territory of Arizona (also known as Arizona Territory) was a territory of the United States that existed from February 24, 1863 until February 14, 1912, when the remaining extent of the territory was admitted to the Union as the state of Arizona. It was created from the western half of the New Mexico Territory during the American Civil War. Following the expansion of the
United States Mission to the European Union United States Mission to the European Union The United States Mission to the European Union (USEU) is the diplomatic mission of the United States to the European Union; it is based in Brussels, Belgium. The US has maintained diplomatic relations with the EU and its predecessors since 1953. The first predecessor of the current mission was the US diplomatic mission to the European Coal and Steel Community in Luxembourg, which opened in 1956. In 1961, the US Mission to the European Communities was established in Brussels, which later became the United States Mission to the European Union, upon the latter's