What were some of the labor saving devices and what did the free up americans to do

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

What was one cause of the decembrist revolt? a. the desire for a constitutional monarchy b. the need for workers’ reforms c. the creation of a new railway line d. the outcome of the crimean war

Which of the following best describe deflation