Which actor delivered what has since become a historically-prescient line: "wait a minute. wait a minute. you ain't heard nothing yet."

The actor thatdelivered what has since become a historically-prescient line: "Wait a minute. Wait a minute. You ain't heard nothing yet."

was:

Al Jolson.

Explanation:

Al Jolson was an American actor, comedian, and singer that once was considered the world's best entertainer. He acted in The jazz Singer in 1927, it was a movie about a singer who comes from a Jewish background and struggles to become a famous singer. This movie was the first one in which music and lips movement were aligned. It started with the phrase: "Wait a minute. Wait a minute. You ain't heard nothing yet."

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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it required the unanimous approval of the states before the congress could enact any measure.