Your special case just needs a massive sea wall all around Denmark, the Netherlands, and Belgium. Once that’s done you can do it! It would only cost atleast 1000 billion dollars probably…
We don’t need to worry about mexico. We need to worry about those crafty Canadians slowing skiing out of their mountains for the good parts of america. My daddy and his daddy and his daddy (so great grandpa) always told me never trust a Canadian. No one is that nice.