Why is there a man dressed as Uncle Sam at every American holiday celebration?

Story No. 21 from my surprising road trip through the early pandemic. I see these videos as a useful historical record of a pivotal year that we're rapidly moving away from.
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Everlands, by Stephen's People
Everlands, by Stephen's People
Surprising stories, videos and photographs from a 35,000 mile journey into the heart of the American pandemic, beginning in June 2020.
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Everlands, by Stephen's People