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According to the book, "Our Flag" published by the House of Representatives, "The colors red, white, and blue did not have meanings for The Stars and Stripes when it was adopted in 1777." It goes on to say, on page 41 (page 47 of the PDF version)[2] that the colors of the Great Seal of the United States, when it was adopted in 1782, were defined thus: "White signifies purity and innocence, Red, hardiness & valour, and Blue, the color of the Chief [the broad band above the stripes] signifies vigilance, perseverance & justice."
Many people also take the red as a reference to the blood of patriots, especially members of the military, who fought for freedom
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