Military
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In San Juan stand the oldest European-type masonry fortifications in United States territory, including the Spanish-built forts of El Morro, El Canuelo, San Cristobal, Casa Blanca, and the old city walls. Dating from 1525-1787, these structures were built to create an impregnable position at the eastern entrance to the Caribbean Sea. The unsurpassed strategic location of San Juan Harbor made the island of Puerto Rico vitally important to the Spanish imperial system in the New World.
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