Way, way too late. If you want south america to replace North America as the center of power you have to do the following
1 Have the US start cutting off immigration after 1848
2 Have the brazillian monarchy get enough of a shock to the system(1848 reovlutions spread to the new world maybe?) to force real reform so we get earlier reforms.
3 Have the 1848 revolutions spread to the southern cone and force changes
The result of all this is a richer, more industrialized and much stronger Brazil, Argentina, uruguay and Chile and a much poorer, less industrialized and more agrarian(more vulnerable to economic shocks) United States. Such a US would be prone to coups anytime from 1870 to 1900(in that period we had period mini-depressions; basically short sharp crashes) and be more likely to go over the edge into despotism of the right/left in the 1930s. You can get your prosperous southern cone/poorer america idea but you just need an earlier POD.
I don't even want a stronger South America, it can remain a sh**thole like now, I'm just talking about Argentina though if I was going to actually play out a scenario like that I would basically go back to 1810 or so.
Do you think that if the British had taken over the Rio De La Plata during the Napoleanic Wars and had kept them that would create a better lasting effect for the area we now know as Argentina?
