21. The period from 1865 to 1920 was one of inventions in the United States. Name one invention in communications and one in transportation from this period that had an important impact on the lives of Americans. Explain how each invention affected people's lives.

Initially, northerners did not want missouri to be included in the union because 1.) maine would not be allowed to enter the union as a free state 2.) missouri wanted to enter the union as a free state 3.) missouri wanted to enter the union as a slave state 4.) maine would not be allowed to enter the union as a slave state