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.

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.