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The flag of Missouri, often referred to as the Missouri flag, is the state flag of the U.S. state of Missouri. It consists of three equal horizontal tribands of red, white, and blue stripes, with the arms of Missouri in the center. Designed by Mary Elizabeth Oliver, the red and white stripes, as is traditional, represent valor and purity, respectively. The blue represents three things: the permanency, vigilance, and justice of the state. The three colors also highlight the French influence on the state in its early years. The Missouri flag was established on March 22, 1913, when governor Elliot Woolfolk Major signed the State flag act making it official.

Source: Wikipedia