What did the Japenese do just before the pearl harbor attack began

Before the Pearl Harbor attack, tensions between Japan and the United States had been mounting for the better part of a decade. The island nation of Japan, isolated from the rest of the world for much of its history, embarked on a period of aggressive expansion near the turn of the 20th century.

Explanation:

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

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just finished this it is b. centrifugal force