B To maintain a standard of living
During the wars many men would go and fight risking their lives. This led to the households not making enough income so women also worked so their family could afford to having a decent standard of living.
The main way in which domesticating livestock allowed civilizations to spread is that people were freed up to do other things like woodworking and opening shops, since they no longer needed to hunt and gather their food and resources.
Answer:
I think justice is an example of forming a more perfect union
