I cannot speak for any state other than Maine, but here in Maine, a meeting took place in the fall of 1985, three things came out of that meeting.
First the forming of Maine State Militia
second the push to change Article 16 of Maine's Constitution
and three the ground work for the secession of Maine from the Union. Maine's borders will be strong and Maine's immigration laws will be strictly enforced.
One law makes that statement fact.
"Any one coming into Maine, other than through an official Border Crossing, is to be considered and armed invader, any Maine Citizen can use what ever force he, she or they deem necessary to repel the invasion."
1985 was quite a while ago. 31 years. So, while whatever was passed may have been interesting in some way, the fundamental transformation of Maine has continued under the iron fist of FedGov, and has not been resisted by the populace.
Maine is a little more conservative than most of New England, but lets face it New England is the most liberal region in the US. Your two lady senators are the epitome of squishy RINOs for instance.
I'm pretty sure that any Maine citizen who shot an illegal immigrant would receive the full retribution of the law, regardless of what some old law says. Because, like it or not Maine is part of Obama's America and no closer to being an independent state than the Old Confederacy is in 2016.
In fact Maine has had a huge influx of Somali's, one of the most violent, criminal and unassimilable African tribes currently flooding into the USA.
Sad, but there it is.