it allowed them to stop being a slave and find them a nicer person to marry besides the cow peasants on the farm
Hmm. I don’t see a strong correlation between money, or borrowing money, and moving to cities.
Is this a historical or a contemporary question?
In both areas cities offer more specialized services and opportunities.
Rural areas offer you services and opportunities around growing foods, farm animals and other natural resources.
Cities offer universities, art, etc.
so they can find better jobs so they can pay back the dept they have !