This wouldn't necessarily lead to a lot more immigration. It would lead to fewer people leaving who are already working for US companies on F-1 student visas in OPT status (they attended US institutions)
Romanians(with GDP of 8k per person) didn't just get up and move to UK once they were completely free to do so in 2012.
US also had mostly free migration between Mexico and US, till some xenophobe decided to put up a legal wall.
Many Mexicans worked seasonally in the US and then returned to Mexico "back in the day". I'm not sure at what point that became a problem though. Although still to this day many people are here in the US undocumented. The extent of that being a problem I'm sure we could debate. It's certainly not fair for those who attempt to play by the rules though.
Is Canada xenophobic? They won't allow just anybody in. I'm not allowed to move to New Zealand without some legal work visa thing they made up. What about France? Can I move to Japan? Why do I have to sign papers to move to any of these countries?
I'm fine if you want to advocate for open boarders (and I think it actually would be great, but we need far fewer people on the planet to make it work) but I think you really should be consistent about it.
Romania is a first world country with a PPP per capita GDP of $33K, compared to $48K in the UK. Their murder rate is 1.28/million, effectively the same rate as in the UK is 1.2/m.
Romanians didn't move en mass because the difference isn't all that great. They would gain 1.45X more income and no change in personal safety.
The average South American country has a PPP GDP of 16K and a regional murder rate of 16/m.
South Americans who migrate to the USA gain 4X more income (8X the economic gains of an emigrating Romanian) and enjoy a murder rate 1/4 of the South American average.
The incentives to flee Romania for the UK are trivial compared to the incentives for South Americans to move to the US.
PPP GDP: https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)...
Murder Rates: https://en.wikipedia.org/wiki/List_of_countries_by_intention...
There is a lot of correlation between immigrant populations across the board, though.
As for income difference... 1.45 times? How about 4-6 times? Unless you seem to think that they would be going to the mythical average UK income area. And let's not forget that there's plenty of EU countries with high income levels. You can get an apartment in Berlin for roughly 2x the rent of an apartment in Bucharest... and get 4x the income. https://en.wikipedia.org/wiki/List_of_European_countries_by_...
Here are some things that can be straight up disproven: * Violent criminals don't migrate en masse with completely open borders * Economic migration doesn't happen, without severe hardships(drought, famine, etc) * Asylum seekers aren't invading armies, that seek to expand war to other countries
I'm suspecting that that billion in large part included people at severe hardships. Although to be fair a lot of them would have super hard time affording a one way plane ticket to the US, as they live on roughly dollar a day.
It doesn't seem clear to me at all that, if I were the spirit of democracy/the hypothetical purely benevolent (to specifically the people I consider of my country/nation/tribe, to the possible detriment of all others) emperor of wherever, that on balance introducing slavery and slaves into my country would be a net boon on average.
Even ignoring the material aspects, it seems like americans had to contort their worldviews quite a bit to justify slavery to themselves, given their otherwise stated moral beliefs (that were useful to maintaining society). Something would have to give a pretty decisive advantage to justify that required cognitive dissonance, and I don't think 'enriching some already-rich landowners a bit more' is useful enough.
I mean, look at america. Are the descendants of the ethnic groups in the us at the time of slavery on average better off for slavery having existed? Now?
Plus it's wrong to inflict such horror on your fellow man etc etc, and there's a pretty huge difference between not letting people in and abducting them into your country and whipping them.
This is the same argument that is used to justify slavery. You don't want to go there.