That the countries of Latin America are democracies has nothing to do with US meddling. The Latin American countries became democracies in imitation of the US. When they got their independence they created Republics with constitutions modelled on that of the US.
Anyway, I fail to see why spreadin "democracy" is considered a good thing. Why should I care if my neighbors live in a democracy or a monarchy?
Tell that to Manuel Noriega and Salvadore Allende.