That running out was also the reason for ww2. As empires could not be trusted on free trade and thus any non empire was one trade crisis away from starvation wi

That running out was also the reason for ww2. As empires could not be trusted on free trade and thus any non empire was one trade crisis away from starvation with haber Bosch. Thus the various "economic independence" aka autarky movements by non colonial powers that became monstrous programs for medieval like farming.