4. which technological innovation had the greatest impact on the growth of the us into an industrialized society? explain.
· steel (bessemer process)
· oil
5. who was the most influential businessman of the late 20th century? explain.
· john d. rockefeller
· andrew carnegie
· j. p. morgan
· cornelius vanderbilt
6. which labor union had the greatest impact on the lives of workers? explain.
· american federation of labor
· knights of labor
· international workers of the world