Does the Prime Minister of Canada have the authority to put down an "insurrection" if Quebec were to declare its independence,as it almost did a few years back? How about Britain's PM? Scotland is holding an independence vote next year.
Perhaps donmeaker knows the answer but what differences does it make? Those examples are utterly irrelevant to the conversation of how the United States conducts her affairs, now or then.
First, Canada is not governed by the US constitution.
Second, yes, they also have the right and duty to put down insurrections.
I would point out that Britain has already fought many wars to end Scottish independence.
Scottish independence would be an amusing example. England has for years subsidized Scotland. With the price of (north sea) oil due to drop due to fracking, Scottish independence is just now a bad bet. Not that Scotland won’t bet that way, just that it will run out of other peoples’ money even more quickly as an independent minor state.
You are aware that Canada is not covered by the U.S. Constitution aren't you?