What technology do steam engine drill oil improved upon or replaced

Which of these effects of mass production techniques used during 1920

The code talkers work contributed mostly to

When the novel made its first appearance in the 1700s, why did it appeal to people of all classes? people could identify with the stories of everyday life. people were entertained by reading about the lives of nobles. people preferred stories that were thoughtful, not full of action. people were excited to read about great historical figures.