The "blue box" or "union" of the US flag dates back to the Continental Congress Flag Resolution of June 14th 1777: "Resolved: that the flag of the United States be made of thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new Constellation." It is likely that the color blue represents the sky since they referred to the stars as a new constellation.
The American flag has red horizontal lines and in one box there is full of stars in the blue background
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the colors on the American flag are red, white, and blue
The blue on the American flag represents vigilance, perseverance and justice
There are no blue stripes on the American Flag. There are red and white stripes for each of the original 13 colonies. The blue part in the left corner with 50 stars is for the 50 states. The blue is because America's colors are red, white, and blue.
An all-blue American flag symbolizes support for law enforcement and the sacrifices they make to protect the country.
The blue and white American flag symbolizes support for law enforcement and the sacrifices they make to protect and serve their communities.
liberty
The Blue field
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There is no true meaning to the blue on the American flag. Betsy Ross added the blue to make the stars brighter. The original flag was read and had red stars.