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It was originally opened as a fortress to protect the entrance of the San Francisco Bay from anyone who might want to gain control of the bay, most especially the British Navy. The bay had become the most valuable port in the world almost overnight in 1848 because of the Gold Rush.

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11y ago
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12y ago

March 21, 1963

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14y ago

1933

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13y ago

1934

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Q: When did Alcatraz prison open?
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