Probably the only solution for most of the Central/Southern American hemisphere is for the USA to go down and colonize the place...
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As you're aware, Spain was the ranking World Empire before Britain.
They spent some 300 years trying to wean the descendants of the
Aztec, Inca, Toltec and the rest; from their tribal mentality; to no avail.
My sense is that we would have to bring the attitude and behavior of
Imperial Rome south of the Rio Grande to fundamentally change their dynamic !!!!