'Depends on where you lived.
Where I reluctantly moved to (after 40 years in South Miami), we had two kinds of "sound trucks": One played salsa music at full bass through speakers mounted in a large panel van. (Although sometimes huge speakers were placed stationary on downtown sidewalks, vibrating every body who happened to drive by).
The other had two large loudspeakers and announced Cuban politics in Spanish while driving through the neighborhood. I'm sooo glad I left. Geez—twenty years ago, announcements in Sears stores were made in Spanish!
My point, though, is that being a "Third World Country" is more than just being Hispanic. The fundamental distinction is economics. Miami does not resemble a Third World Country in that regard.