LOS ANGELES (AP) — Aiko Herzig-Yoshinaga, who uncovered proof thousands of Japanese-Americans incarcerated in the United States during World War II were held not for reasons of national security but because of racism, has died.

Bruce Embrey, co-chair of the Manzanar Committee, said Wednesday that Herzig-Yoshinaga died July 18 at her home in the Los Angeles suburb of Torrance.

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She was 93.

Her discovery of a 1942 document in the National Archives revealed that approximately 120,000 Japanese-Americans weren’t sent to camps around the country for national security concerns.

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The real reason, according to the document, was because Japanese cultural ties led authorities to believe it was not possible to tell spies from law-abiding citizens.

The revelation led to a 1988 executive order from President Ronald Reagan offering apologies and $20,000 payments to each of those incarcerated.

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