When was the early national period?

Nhow the other half lives, jacob riis: a. wrote about captains of industry. b. highlighted the benefits of the second industrial revolution. c. provided a fictional account of life in 1890. d. discussed the lives of wealthy americans. e. focused on the wretched conditions of new york city slums.

Which factor has played the most important role in changing the way history is studied over time?

What do you think was a drawback to this method of calculating distance