By SAKI KNAFO

In the summer of 2001, Roberto Sosa, a delivery driver for a sewing machine company, started a soccer organization for Mexican-American children in Red Hook, Brooklyn.
Its name, Liga Mexicana de Fútbol Infantil, or Mexican Children’s Soccer League, was straightforward enough — except that all the players were boys. Mr. Sosa, 37, had grown up in Puebla, a city in Mexico, where in those days — the 1980s — soccer was a guy thing.

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