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Japan attacks United States air base, at Pearl Harbor, Hawaii.
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Hanford Nuclear Powerplant is established for the creation of plutonium that the United States use for the first atomic bomb.
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Plutonium production begins at the Hanford Nuclear site, releasing radioisotopes into the environment.
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The Fat Man Bomb is released on Nagasaki, Japan.
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19,000 documents of Hanford's activity during the earlier years of plutonium production was released.
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Hanford Historical Document Reveiew comitee was formed.
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An additional 20,000 pages were released about Hanfor'd activity in its earlier years.
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Hanford Nuclear Site is shutdown and all nuclear activity is stopped.
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Tri-Party Agreement was created.
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Scientists estimate that all cleanups will be complete.