a state in the south-western US, also known as the Grand Canyon State. Its capital and largest city is Phoenix. Arizona's natural features include the Grand Canyon, the Painted Desert and the Petrified Forest. It was the home of the Apaches in the 19th century, and today Native Americans have 20 reservations (= areas of land given and protected by the US government) in the state. Its most important industry is manufacturing, especially of electrical and communication equipment. It also produces more than half of the country's copper.