I view it as a remote possibility, if things go off the rails down south. As for the commonwealth, that would mean nothing, the UK will be in no position to help, but it would be the end of NATO. However if the worst would happen, it would have a pernicious effect on democratic institutions world wide, including Canada. We don't need to be invaded, just subjected to enough bullshit coming across the border and shoved down our throats. There ain't much we or other countries can do about YouTube and American based social media, regulating it and hate media in America is essential for their survival and the health of other democracies. Democracies depend on an informed electorate, not on a misinformed one, or one where the population is whipped into a frenzy causing it to go tribal and turn on minorities.