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‘Congress approved an appropriation of $50,000 on March 1, 1869, to deepen the approaches to this harbor.’ But ‘[until 1898] the U.S. did not fortify Pearl Harbor as a naval base. The shallow entrance constituted a formidable barrier against the use of the deep protected waters of the inner harbor as it had for 60 years.’
Can you clarify the sequence of events by which the harbour was deepened/widened? Valetude (talk) 11:03, 24 October 2014 (UTC)