The Japanese attack at Pearl Harbor was successful because . Select all that apply.

-it caught the U. S. by surprise

-it was carefully planned in advance

-there weren't enough American troops available

-it took place while peace talks were still going on

-no one thought the Japanese planes could fly that far

it took place while peace talks were still going on

the population grew a lot and was making more money

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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