Named after the saint patron of land travelers, Saint Christopher, Castillo San Cristóbal, is considered the largest fortress built in the Americas. It was built for the purpose of protecting the city of San Juan from attack by land from the east.
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All persons born in Puerto Rico on or after January 13, 1941, and subject to the jurisdiction of the United States, are citizens of the United States at birth. (June 27, 1952, ch. 477, title III, ch.