The Fed's can declare Canada's Inside Passage as sovereign, internal Canadian waters, this as opposed to Canada's current agreement that it is an international waterway.
As much as the Americans can amend whatever act obliges them to call to port in Canadian waters when transiting North to Alaska, so too can Canada ban all cruise lines from transiting internal Canadian waters unless they have at least one port of call in Canada.
In the above scenario, lots of useless bluster, but nothing changes!
Good luck to the cruise ships sailing in the constantly raging, open seas outside of Canada's Inside Passage, with all cruise passengers stuck inside their cabins for two days, heaving-up the previous nights dinner.
Of course the above is nothing more than a thought exercise, as nothing like banning American cruise ships from Canadian waters will ever happen, it's just a reminder that everything can, and does cut both ways.
But the thought exercise does lend weight to Canada's pre-negotiation stance with the U.S.
In this case I'm not seeing anything here but a blustery, solid red State (Alaska) putting forth a news release in response to Eby's transit tariff exercise.
It's no surprise to see Alaska contribute to Trumps ongoing efforts to wind Canada and Canadians up, as Alaska is hardly now, and never has been a friendly blue state to British Columbia and Canada, it certainly isn't is Washington, Oregon, or California.
So we get tit for tat, back and forth, and so it goes.