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Flag - Wikipedia
Flags of the World | Flagpedia.net
flag of the United States of America - Encyclopedia Britannica
Flag of the United States - Wikipedia
Country flags of the world (list of all 254) | Flagpedia.net
Flag | Origins, Forms, & Functions | Britannica
Flag of the United States - Wikiwand
The American flag and other national symbols | USAGov
Facts about the United States Flag | Smithsonian Institution
National flag - Wikipedia