Here in the USA, Trumpists are very hostile towards immigrants coming from the Mexican border to the point where they infamously proposed to build a wall. The Biden administration is better in-name only, and has kept the concentration camps at the border.
Why is there so much hatred toward these immigrants? What is the material cause of this?
OP asked for a material explanation.
If you voted for Trump and support the wall and deportation, and you have a material explanation for that, then just post it.