I think it's all those, but as a dual Canadian and American I believe the paramount problem in the US are the 77M Americans who voted to restore the fascist insurrectionist and convicted felon to power in '24 and the 40% of voters who didn't bother voting to stop him.
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We need to ensure we are making changes not because of one leader.
I do believe America may not recover from Mr. Trump and then it would be an America issue.
It is more than Mr. Trump but the lack of accountability of the Congress and the anemic responses of the Supreme Court.
Having said that, one needs to ensure one can survive a separation. I am not sure we can either economically or from a security basis.
Too many are OK with fascism.