And south American w.r.t. the U.S.: I'm really not that knowledgeable about geopolitics in this part of the world.
Blaming all the region problems on the "imperialists" and stuff like that is a line of thought still very alive and kicking around here - it is way easier to blame some imaginary entity than taking responsibility for your present situation. It is very inline with the current "outrage porn" culture.
[1] https://www.amazon.com/Open-Veins-Latin-America-Centuries/dp...
Note that empires do NOT do this, as they need to force stability,unity and legitimacy from the top, while confederations of democratic states get their legitimacy from the bottom (if designed well. There is lots of improvement left in the road towards democratization of the EU).
The ironic things is that we seem to recognize it and try and do this exactly in the places where it's not really needed: take the "European Federation" ideal, it probably wouldn't be a net plus since almost all European nations produce basically functional states and provide OK levels of individual freedom. Otoh something like a Middle-Eastern Federation and a Central Asian Federation could solve a ton issues and really be useful. A bunch of mega-states would surely improve lives of people in most of Africa too.
Dunno why we're so taboo ridden and afraid to be open-minded when it comes to geo-politics on a planetary scale, we're stuck with these two horrible ideas of (1) independent nation-states and (2) general-globalism, that are neither any good, and we're totally afraid to think outside the box...