http://en.wikipedia.org/wiki/1970_FIFA_World_Cup_qualification#North.2C_Central_America_and_Caribbean_.28CONCACAF.29
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El Salvador became the first Central American team to qualify to a fifa world cup; firstly in 1970, and also the first to do so twice; in 1982.
I think you mean to ask, "Did El Salvador ever win the world cup?" The answer is no, no CONCACAF team has won the World Cup.
England and U.s.A. have qualified for a world cup.
The U.S.A has not yet qualified for the 2010 world cup.
Malta have not yet qualified for a single world cup as yet.