The Arizona state flag was adopted on February 17, 1917, by the 3rd Arizona Legislature. The design consists of 13 rays of red and weld-yellow on the top half, the colors of the flag of Spain, honoring the 13 original states. The red and yellow represents Arizona’s world-famous sunsets. The copper star pays tribute to the copper mining industry in Arizona, the largest in the United States. The rest of the Arizona state flag is colored blue, representing the Colorado River. which flows into Lake Mead on the Arizona-Nevada border.