Which of these was a reason for the United States engaging in imperialistic efforts after the Industrial Revolution in the U. S.? A. The U. S. wanted to reach out with humanitarian aid because of the good fortunes of a strong economy. B. The U. S. had experienced an industrial boom and needed to establish markets to trade these goods. C. The U. S. was developing an isolationist mentality because of all the warfare in the world.​