>>8976655They did that indirectly. If you help your family and your community, you help the place you're living in. I could learn how to install a working heater system for example. If I build one in my home I might as well make one for somebody else that I know. Maybe for money or just because he's a good friend.
That good friend maybe learned another craft that could help me in turn. Like this you create systems for people that tend to find similarities in each other. From village to city to regions to whole nations.