If you believe in America's founders, you should believe in open borders. America's foundational documents are based on the the social contract theory of Hobbe

If you believe in America's founders, you should believe in open borders. America's foundational documents are based on the the social contract theory of Hobbes & Locke - they differ on some aspects, but largely agree that governments are formed to elevate people from the State of Nature - we enter into a social contract to elevate ourselves. But people nowadays don't form governments - and very few have much influence over the government in which they live. If you are born into a country, you are subject to the governance of that country. By restricting the right of people to relocate to new governments, we deny them the ability to meaningfully assent to the social contract in which they live. If I'm born in a "shithole country" and I don't like it, tough luck. I gotta roll the dice to see if I get accepted for immigration in countries whose social contracts and mores I do agree with. I've never agreed to the social contract under which I am forced to live. The conservative view on borders is based on fear - the desire to protect the in-group from the out-group. Despite their objections, it is in direct opposition to the foundational ideals of this country.