Immigration change question.

If the USA were to ban all "Non Christian" immigration to their nation (include baring Catholics) in the late 1830s early 1840s on too about 1900 how will this effect immigration to the rest of the new world and European Empires.

Also is it realistic at all too see a large Irish population move to the Catholic nations like Mexico?

I know this would have MASSIVE adverse effects on US industry, but what other issues would we see coming?

(PS. I have several ideas on what might happen, but its not my area of expertise. Any help or comments would be great thanks)
 
If the USA were to ban all "Non Christian" immigration to their nation (include baring Catholics) in the late 1830s early 1840s on too about 1900 how will this effect immigration to the rest of the new world and European Empires.

Also is it realistic at all too see a large Irish population move to the Catholic nations like Mexico?

I know this would have MASSIVE adverse effects on US industry, but what other issues would we see coming?

(PS. I have several ideas on what might happen, but its not my area of expertise. Any help or comments would be great thanks)
Totally unconstitutional, at least if worded that way. What you could do is have earlier national quotas, and/or property or literacy tests.
 
Totally unconstitutional, at least if worded that way. What you could do is have earlier national quotas, and/or property or literacy tests.

Maybe not. SCOTUS has ruled that Constitutional rights do not apply at the border, only to people already in the US (whether legally or illegally). For example, you have no 4th Amendment protection from unreasonable search and seizure; Customs can (and does) do whatever they want to you when you enter. Banning non-Christian immigration may be ruled no different than the 20th Century bans on Communist, Nazi, and Anarchist immigration.
 
I may also add that this is for a time line where America was founded partly on Christian fundamentalism.

AIUI, what we now know as "fundamentalism" really didn't start until the Campbellite era (c. 1820). Before that, Protestantism was mostly what we now call the "mainline" denominations. Yes, the churches were "morally" stricter back then, but they were more or less liturgical and not of the "by faith alone" mindset.
 
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