.............................
Humans need to eat and drink in order to survive, therefore it against natural law to deprive oneself of food and water, as natural law says that species must survive.
There were more jobs in the cities, if everyone worked on a farm there wuld be more than billions of grocery stores, then they would be wasting food because not everyone would buy evrything!
The three-fifths compromise provided for counting slaves for representation in Congress and in the electoral college.