This way they can do things like round up guns or people without breaking US law, and later it will extend to Mexican as well as other troops.
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It would also be present a tougher psychological barrier for many Americans to ambush and massacre a Canadian occupation unit than, say, a Syrian or Indonesian or Nicaraguan one.
Initially, anyway.
Meet the new Hessians. Same as the old Hessians.
“Meet the new Hessians. Same as the old Hessians.”
Remember what happened to the old Hessians.