Statement of Significance (as of designation - June 13, 1962):
The Presidio has served as a military reservation from its establishment in 1776 as Spain's northern-most outpost of colonial power in the New World. It was one of the longest-garrisoned posts in the country and the oldest installation in the American West. It played a key role in Spain's exploration and settlement of the borderlands, Mexico's subsequent control of the region from Texas to Alta California, and the United States' involvement not only in frontier expansion, but also in all major conflicts since the Mexican-American War of 1846-48.
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