The U. S. did not want to invade Japan because they: did not have means to transport soldiers from the U. S. to Japan.
wanted to focus on the war in Europe.
feared it would lead to a significant loss of life for U. S. military personnel.
did not think they could win a battle on Japanese soil.

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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