The "Grand Canyon State," Arizona, was the 48th state to join the U.S. in 1912-- the last of 48 contiguous (connected) states to join the Union. The state's name comes from arizonac, from two Papago Indian words meaning "place of the young spring." Arizona has a very dry climate and is known for its cactus plants. In fact, the state flower is the saguaro cactus blossom.