Millions of Mexicans descend annually on the Basilica of Our Lady of Guadalupe, especially for the feast day Dec. 12, with many making pilgrimages on bike or arriving on foot from the surrounding states. The devotion shows few signs of fading while growth in the United States, through immigrant communities, is strong.

Mike Davis is a lively and gifted writer of the left with the flair—even if often polemical—of a born journalist.