I can confirm the answer is A. federalism
During this era, human technology boomed. In this era, nomads have started farming. Nomads have stopped moving from one place to another. They have started forging metal tools. They also started pastoralism. They have communities and tribe. They were able to create a system on their own.
I think the last option might be right too
A money economy begin to replace the barter economy in the high middle ages because : B. as trade expanded to cover greater distances, a unit of exchange became more important
It was created to protect ad help former slaves after the war.
