A. Answer the following questions. 1) Why were the late 1800s good years for entrepreneurs in the United States? 2) When was the first American oil well drilled? 3) What did John Rockefeller do when he was 24? 4) What did J. P. Morgan do with his family business? 5) How did city people live after the Civil War? 6) How did cities in the United States change after the Civil War?