Maurya Empire and Gupta Empire are the most significant but there has been more than that.
Hope this helps!
In the lower South the majority of slaves lived and worked on cotton plantations. Most of these plantations had fifty or fewer slaves, although the largest plantations have several hundred. Cotton was by far the leading cash crop, but slaves also raised rice, corn, sugarcane, and tobacco.
So slaves did a lot of heavy farm work and were household servants.
1. Tax Code
2. Employment and Labor Law
3. Antitrust Laws
The term for the significant growth in population following WWII is the "baby boom." We also now refer to those people as "baby boomers"