Japanese-Americans were held at the Oahu camp during World War II.

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WAIPAHU, Hawaii — Hawaii’s largest internment camp where Japanese-Americans and others were held during World War II is now a national monument.

U.S. Secretary of the Interior Sally Jewell joined Hawaii Gov. David Ige, Hawaii’s congressional delegation and other officials for a dedication ceremony Tuesday of the Honouliuli National Monument.

President Barack Obama established the new monument, west of Honolulu near the town of Wipahu, in February.

The 155-acre site opened in March 1943, and interned Japanese and European Americans and others, eventually holding 400 civilian internees and 4,000 prisoners of war.

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Honolulu Mayor Kirk Caldwell says preservation of the camp as a national monument is a proud but bittersweet moment. He says it’s an important part of history that should be remembered and learned from.

The Seattle-based Densho project has extensive background on Honouliuli.