In other countries illegal aliens are deported because they are breaking the law. In Bolivia you would have a very difficult time finding bolivians who want to allow illegal colombians or brazilians to stay in the country. They want them out because they disproportionately commit more of the drug/violent crime.
In argentina, they want illegal bolivians out because they take jobs for very little money.
You can go on country by country.
Why is the US so divided on this? Who spent so much money to push this train of thought for decades onto people?