The blocking of the Canadian hoardes invading each year the waterways freeze over is why the USCG keeps so many icebreakers busy each winter.
You'll notice that we turn a blind eye to all the illegal Canadian deer, moose, elk, & other illegal 4 legged critters that are crossing the border freely.
Yes, I am making a joke. Bo
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QMC, USCG (Ret)
The best luck is what you make yourself!