"Mankind" is a global reference, not a European one.
But for interest sake, please describe the difference you see between European and American nationalism.
While you're at it provide a link or two: It is insufficient to "declare truth" by undocumented assertion.
Isaac Asimov Nails Devious Donald And His "Basket Of Deplorables"
http://paxonbothhouses.blogspot.com/2018/01/isaac-asimov-nails-devious-donald-and.html
"Voilà! I Just Pluck It Out Of My Ass."
https://paxonbothhouses.blogspot.com/2018/12/voila-i-just-pluck-it-out-of-my-ass.html
