American Inventions | American History

40 Greatest Inventions & Innovation of the 21st Century - INVENTgen

Inventions 1900 to 1990 - History Learning Site Inventions 1900 to 1990

19th and 20th century psychiatry: 22 rare photos

Now You Know: Why Do People Always Look So Serious in Old Photos?

Lectures in History-Use of Racial Terms in 19th Century Literature

Lectures in History-Morality in 19th Century Literature

Overview of 18th Century Poetry