USA is not some nation that is trying some one race thing, they are filled with a million different races, people from all over the world go there. The logical differences is that USA is a place that accepts immigrants, in fact, every single year there are green card drawings that end up taking a certain amount of people (in thousands) to go live there if they want to, and that is the difference in the south of the wall understanding.
Instead of building a wall to keep people away, they could just put in entry points where you get the information of those people, put them in places like true immigrants, and make them live the USA life. I have a friend who did that to Netherlands, and immigrated, and it wasn't anything like this. Why try to build a wall, when you can build a door?
People still think the US is the land of opportunity though that's why people go there looking for greener pastures. But with Biden, they allow those borders to open hoping he gets votes from those refugees. They don't call it immigrants anymore, it has to sound like they helped them so they call them refugees.
They are surrounded by countries that have no power to conquer them. The rest of the countries in America are poor. It's not the Middle East, Israel has to surround the country with walls despite the land not being their own.