[eftychis]

However, United States of America does not claim in this situation historical figures of Canada, Mexico and rest of South America to be U.S.A. nationals, or publish maps with its aspired borders including Quebec or Mexico City. For instance, they claimed that Simon Bolivar was U.S. national.

The situation is way more complicated than people expect or are comfortable with. I am not objective in this situation to give you a full analysis, but I would suggest if you want to have a full picture to start by looking at Balkan Wars to get an idea about the imperialistic dreams of each country in the area and the events. WWI shows how things evolved afterwards. Just checking the alliances is enough.

Then read about WWII specifically in that area and about Josip Broz Tito [0] (for starters) and dig in why he introduced new history and an identity and what were the political aspirations after WWII and why Yugoslavia was created and the naming of its regions.

I tried to give an objective guide to read the situation. Again personally I am perhaps not objective, as I have a stake in the situation.

[0] https://en.wikipedia.org/wiki/Josip_Broz_Tito