The United States of America in the singular is a country, not a nation. It contains nations within it, but does not itself constitute a nation. Nations involve solidarity among people who share a common culture, language, customs, mores, ethnicity, and history. A country, by contrast, involves political arrangements and governmental territories and boundaries.
The United States is not a nation.
-Allen Mendenhall
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https://www.abbevilleinstitute.org/blog/the-united-states-is-not-a-nation/?mc_cid=ee989a75c2&mc_eid=29256acbee