I don't think this needs explanation.

hahaha maybe yes
Brazil is RD and Argentina AJ because they’re competitive.
Argentina and Chile are AJ and Flam because of their bad relationship.
Uruguay is like a little Argentina so it’s Apple Bloom.
Countries with many indigenous population are kirins.
Colombia is Zecora because of his Afro-descendant population.
Venezuela is obvius.
The three small countries are foals.