Books like The Origins of American Slavery
Betty Wood
The Origins of American Slavery is 132 pages, about 2 hours 25 minutes at 250 words a minute.
8 books to read next
How long each takes
How the Word Is Passed 6.3 h 
American Slavery, 1619-1877 5.6 h 
Ar'n't I a Woman? 4.0 h 
Half Slave and Half Free 5.4 h 
American Slavery, American Freedom 8.3 h 
The Other Slavery 8.2 h 
The White Man's Burden 4.2 h 
The History of Mary Prince, a West Indian Slave, Related by Herself 1.3 h Bar height shows length. Estimated at 250 words a minute.