Or, it did on February 14th, 1912. As state forty-eight, Arizona was the last of the continuous states to be admitted to the union. During that time copper was the primary industry and remained one of the most prominent industries of the state until the 1950s. To memorialize Arizona's copper history the star in the center of the flag was colored copper. The alternating red and yellow stripes that come off the star symbolize the rays of the sun.There are 13 rays that represent the 13 original colonies and red and yellow where chosen to symbolize Arizona's desert sunsets and Spanish history. Lastly, the blue was used to represent the Colorado River and is the same blue used in the U.S. flag. While Arizona's flag has not changed since its unveiling in 1917, Arizona has grown by leaps and bounds since becoming a state and is now the 17th most populous state in the union. Happy Statehood Day Arizona!