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Japan and the United States signed a gentleman's agreement whereby the former would not permit further emigration to the U.S., while the latter would not limit Japanese immigration.
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Gentlemen's Agreement of 1907
Informal agreement between Japan and the U.S.
The Gentlemen's Agreement of 1907 was an informal agreement between the United States of America and the Empire of Japan whereby Japan would not allow further immigration of laborers to the United States and the United States would not impose restrictions on Japanese immigrants…Source: Wikipedia (CC BY-SA)