How did we manage to eradicate malaria in North America (but we still have lots of mosquitos,) but it remains endemic in much of the world?

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We eliminated it with an ungodly amount of DDT, which we only realized later was wreaking havoc with the environment (as detailed in the book Silent Spring). Other parts of the world either lack the infrastructure for such systematic spraying or are concerned about the environmental effects (there may also be some legal stuff wrapped up in this part, as DDT is banned in some places).