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You have the citizenship of your country, and if that country is in the EU, also conferred upon you is EU citizenship.
It was a plurality, not a majority of the ~64% of the electorate that bothered to vote, not a majority of the US population. So roughly 30% of eligible voters (who make up ~70% of the population , so ~20% of the population voted for Trump[0])
So, if you don't mind, let's not paint all Americans with such a broad brush okay?
[0] https://en.wikipedia.org/wiki/Voter_turnout_in_United_States...
Many of them had reasonable excuses, due to how hard we make it to vote in this country. But an awful lot of them took a look at the two candidates, shrugged, and said "Looks like a tossup to me." I can't imagine the EU wants them much more than it wants the 30% who actually voted for it.