It’s interesting that the relative costs of offense vs. defense vary with technological development. In the middle ages when castles existed but guns did not, a

It’s interesting that the relative costs of offense vs. defense vary with technological development. In the middle ages when castles existed but guns did not, and societal structure was such that mounting enormous besieging armies of antiquity was not possible, the borders mostly stayed intact. It’s possible we’re entering something similar judging by the drone war in Ukraine which seems to heavily favor defense.