Never, free people are to be walled in.
Today, Free people CHOOSE to be walled in. That's one of the things that got Trump elected. The enforcement of the immigration laws that out ancestors set up to protet us.
Sure, america's "free" people choose to be walled in from the hyped up hysteria around the migratory blowback of US meddling, destabilizations, dictator support and coups in South and Latin America going back decades. America's "free" people choose the militarization of its police. America's "free" people choose to live under mass surveillance. America's "free" people choose to have its military in 70% of the nations on the planet while supporting 73% of the world's dictatorships. America's "free" people choose the partnering with entities like al Qaida, al Nusra, Saddam, Osama, and the radical public square beheading Islamist Saudis. America's "free" people choose to condone and accept it's ruling aristocracy's patronage of Epstein's/Maxwell's (who is still footloose, fancy free and at large by the way) child sex tracking operation over decades.
All of which points to the fallacy of "laws" in american society. Americans fear what they did to come by this land mass. Your ancestors set up a "free" society in which only wealthy aristocratic white males were granted the "inalienable right" to representation via the vote. And the Senate was appointed by the aristocracy.
What got Don elected was the same thing that got Obama elected, an ignorant American public unable to throw off all the Pavlovian conditioning and partisanshithead imprinting.