Arizona is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. Historically part of the territory of Alta California in New Spain, it became part of independent Mexico in 1821. After being defeated in the Mexican–American War, Mexico ceded much of this territory to the United States in 1848. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase.
Delaware occupies the northeastern portion of the Delmarva Peninsula and is the second smallest, the sixth least populous, but the sixth most densely populated of the 50 United States. Delaware is divided into three counties, the lowest number of counties of any state. From north to south, the three counties are New Castle, Kent, and Sussex. While the southern two counties have historically been predominantly agricultural, New Castle County has been more industrialized.