Its hard to disagree with anything Mr Homer-Dixon says. What I don't understand is what the hell Canada can possibly do about it.

I have a great deal of respect and admiration for the Canadian nation and people (its what the USA would look like with no guns, decent health care and no history of institutionalized racism. But there is little Canada can do to avoid being overwhelmed by events in the USA. And there is even less it can do to influence them.

The only international agents capable of deliberately affecting events in the United States are Russia, China and possibly Iran.
As we used to say in the NAV; "Stand by for heavy rolls."