Restructure your economy so you don't have to exploit people to make a decent living.
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?
1. enforce e-verify nationwide. If a company is caught employing undocumented workers and the company is not using e-verify, the executives are put in prison. Documentation fraud from the immigrant remains a crime punishable by prison and deportation.
2. Regardless of deporting or not, those in detention should be treated humanely, given food, water, shelter, and adequate space. Parents and children should not be separated. For those not charged with a crime, it should not be built the same way as a prison -- It doesn't have to be the Four Seasons to be humane.
3. ICE raids terrorize legal residents and citizens of color. As mentioned in #1, any such "raids" should be against HR. If you make employers accountable, the problem becomes much smaller. Yes, if someone is arrested and is undocumented they should be deported. No, we shouldn't be breaking down doors and sending militarized teams to do so.
4. Immigration reform is a completely different topic.
Extending this today to other Nations is not so foreign an idea.
That being said, I personally would not mind retiring in the UK with British medicine, British housing and British retirement benefits.
This idea that 'America Great Again' means selfishness and abandoning the old and poor, is a purely modern idea of the last decade.
This assumption that the US is uniquely strict in its border enforcement does not seem to hold water.
Orange Man bad, basically.
The left's position has not changed much on border security at all. Process asylum claims faster, penalize employers for participating in illegal hiring, and use modern tech to control borders.
If I had to stack-rank:
(a) a literal Southern border wall motivated by President Trump's vile campaign rhetoric.
(b) making the border completely open and defunding ICE entirely
I'd prefer (b) - but I still think (b) is a terrible idea. I actually (unlike most people who are "afraid of immigrants") know a convicted violent felon who was deported from the United States to their home country (in Europe) after serving a prison sentence who I legitimately think is a threat to people I care about, and who I don't want re-entering the country under any circumstances (Ironically the deportee is a diagnosed pathological narcissist) - and I still prefer open borders to what the current executive leadership of the United States is pushing.
The question is not whether to have controls on who/what crosses the border, the question is how and why.
I personally think the marginal utility of spending additional Federal dollars policing the border and enforcing immigration controls is a net negative to the United States given our current infrastructure, so I believe we should spend less time and money doing it. That doesn't mean there aren't other avenues for controlling externalities caused by illegal immigration (such as they are).