Militarizing the border implies not just a thin line at the physical demarcation. It's an entire apparatus extending well inland for well over 1500 miles of border that's "easy" to cross. This has been theorized enough times in recent history to see it's an idea like a block of swiss cheese. It simply does not work. Again not even touching the legality of such a thing.
It should be self-explanatory that arming a previously peaceful border will compel the other side to do the same. Once you open that Pandora's Box it impacts everything downstream. Mexico has been our #1 trading partner for a few years now supplanting China. Everything from agricultural products to Chevy trucks come across that border every day to the tune of Billions of Dollars.
As I've said many times before we can't have good political discussion without working from the same set of facts. To say that 20-30 million people have entered the country in the past 3-4 years is a falsehood. The Federation for American Immigration Reform (leans R) puts the entire unlawful immigrant population at just under 17 million. This includes those who have been here for decades. Note below that the increase follows nearly the same trajectory for the Trump years as it does for Biden when you exclude the Covid emergency measures in between. The fact is these people come because they believe wrightly or wrongly they'll find a job. Until employers in this country are held accountable for employing illegal labor and their home countries aren't so much of a *insert infamous Trump phrase* they aren't going to stop coming. Take a look at the occupational makeup of your State Legislature and it becomes crystal clear why nothing is done even at a state level.
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