The explanation above is correct!
What made it self-sufficient was whether it had enough land and serfs which could produce enough food for people to survive on the amount of food that they would produce.
I think so, we already are right now and it’s so far been pretty peaceful besides Iran and those middle eastern countries. They hate Americans anyway, but to answer your question yes, I think we should we are the peacekeepers of the world and if we don’t go in and try and stop other countries from trying to rule more land we will have another world war.
