The answer to this question is A agriculture :)
Ecotopia was the name given by the author Callenbach to the region of Megalopolis.
The freedmen, who wanted autonomy and independence, refused to sign contracts that required gang labor, and sharecropping emerged as a compromise. ... In exchange for the use of land, a cabin, and supplies, sharecroppers agreed to raise a cash crop and give a portion, usually 50 percent, of the crop to their landlord
Wilson
even in his moto he kep us oit of war
The fall of the Roman Empire was because of the outside and external invasion from the Huns, because of political corruption, economic troubles, overexpansion, military overspending, and the weakening of Rome's military. Hope this helps.
