The main color of the flag of the United States is blue, along with red and white. The flag features thirteen horizontal stripes representing the original thirteen colonies and a blue rectangle, or canton, in the top left corner filled with fifty white stars. Each star represents one of the fifty states in the union. The flag’s colors—red, white, and blue—symbolize valor, purity, and justice, respectively. The design of the flag has evolved over the years, with additional stars added as new states joined the union, and it serves as a powerful symbol of American identity and patriotism.