Spanish Silver and Philip II's Defaults
A mountain of silver from the mines of Potosí in the Andes made Spain the richest empire on Earth — and it still went bankrupt four times in a single reign. Philip II's endless wars outran even the New World's treasure, while the flood of silver itself unleashed inflation across Europe. It is three patterns braided into one empire's decline: overreach, serial debt default, and the debasing of money's value — proof that no amount of income can outrun commitments that grow faster.
A state's commitments outrun the resources and logistics needed to hold them; the margin fails first.