In the central square of Crystal City stands a statue of Popeye, a symbol of the town's claim that it is “the spinach capital of the world.” Otherwise, Crystal City is like a lot of other farm towns in South Texas. Mexican-Americans outnumber Anglo-Americans four to one, but the Anglos run the place.Last week, with Texas Rangers standing by to keep order, hundreds of Crystal City Mexicans gathered round the statue of Popeye