To the OP, most states outside of the Northeast, California, Hawaii, and Illinois are pretty gun friendly. In most of those you can CCW via Constitutional carry or you'll have reciprocity with a CCW from your home state into another state. Many States are suppressor and full-auto friendly. I'm in Ohio and can shoot F/A Thompsons or anything else in the backyard. I'm in a township, across the street from a city park.
In much of the US, there is about a zero chance of success for any foreign invader to sustain troops here. Firearms number about 500+ million in a country of less than 400 million ppl.
To be honest, we do have too much gun violence - much of that is urban and cultural in nature. Areas I tend to avoid, but am always armed when travelling through.
