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The first Japanese to settle on the U.S. mainland arrive near Sacramento, California
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The U.S. Bureau of Immigration and Naturalization orders that declarations of intent to file for citizenship can only be received from whites and from people of African descent, thus allowing courts to refuse naturalization to the Japanese
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Alien Land Bill prevents Japanese aliens from owning land in California.
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Congress passes an Immigration Act stating that no alien ineligibke for citizenship shall be admitted to the U.S. This stops all immigration from Japan.
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December 7: Suprise attack on Pearl Harbor by the Japanese.
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President Roosevelt signs Executive Order 9066, giving the War Department authority to define military areas in the western states and to exclude from them anyone who might threaten the war effort.