There were approximately 400,000 slaveholders, white slaveholders, in the American South by 1860.

截至1860年,美国南部,大约有四十万白人奴隶主

耶鲁公开课 - 美国内战与重建课程节选

Now, when exactly did the American South become a slave society?

那么美国南部究竟是从何时起成为奴隶社会的

耶鲁公开课 - 美国内战与重建课程节选