Opposition to Asian immigrants led to the 1907 gentleman’s agreement with Japan ñ. This informal agreement stated that

Explanation:

The Gentlemen's Agreement of 1907 was made for the goal of reducing tension between the USA and Japan. It stated that the United States would not impose restrictions on immigration and that the Empire of Japan wouldn't allow any more immigration to the United States. The agreement was later replaced by the Immigration Act of 1924.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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