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.
South Carolina became the eighth state to ratify the U.S. Constitution, on May 23, 1788. South Carolina became the first state which voted to secede from the Union on December 20, 1860. After the American Civil War, it was readmitted into the United States on June 25, 1868.