ANENECUILCO, Mexico -- I wish my American friends who fret about Mexican immigrants could be here with me. Listening to Emiliano Zapata, a laborer who happens to be the grandson and namesake of the legendary Mexican revolutionary, they perhaps would get a clearer sense of how the migration of Mexicans originated a few decades ago and why it continues today. The state of Morelos is where Zapata's revolution -- one of the various armed struggles that made up the multifaceted Mexican Revolution -- started almost a century ago, before it spread all across the south of Mexico. Zapata was a...