Why has the US become so divided?

Every single election roughly half the country is unhappy, and declaring they’re moving to Canada. Things were not always like this. I think a name change is in order because we are anything but united

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And libs , don’t even try for a second saying Trump is responsible. We were divided well before Trump.
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Gag , you don’t determine for me what I can and cannot say on my own post
Why has the US become so divided?
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