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For me, it was the trucker protests. I spent hours and hours watching livestreams and then comparing that to the coverage in the mainstream media. (Overwhelmingly from what I saw, there were ZERO problems until the police showed up and started raising a fuss.)
Trudeau refused to meet with the protestors (had "covid", he said) and then declared them terrorists and froze bank accounts and donations. (Even from Americans.) Here's one of many articles I wrote at the time about what this portends for all of us:
This is 100% what the Biden/Harris faction of the Democrats had in store for "insurrectionist" Republicans. And now we see the banning of candidates/overturning elections in Belgium and Germany.
TL;DR: I pay attention to Canada because that's our future in America if we're not careful.