SO Egypt.... Egypt started thousands and thousands of years before anyone, somewhere around 5000-3000 BC. One of the first major civilization but it came to a end when Rome took over Europe and half of the known world and after Rome fell in 476 AD Egypt was never mentioned in any history books... So the "New Kingdom" fell due to Romans and since they had no armies to defend themselves.
Hope this helps :)
I believe that some of the benefits are longer life span, the ability to harvest crops, and the ability to create a thriving community. I think these are good benefits because if you are living in a permanent settlement then you can grow your own crops meaning that you can live off of those crops and you dont have to go foraging for food (sometimes producing nothing). Also a good community is almost essential to living with a group of people beacause it enhances trade and communication with other communities as well. :)
The sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy