Elements lika steel and iron corrode so y not power
It does corrode. And ironically,
it corrodes in such a way that the owner does not even realize it until he has nothing left. Reason? Diversion from their main goal and focusing on 'other' stuffs.
eg. Roman empire, british empire, Soviet union, Nazi, Babar, Akbar, Mughal etc.
None of them exist now.
The way American focus is diverting from what was its founding father's - seems like its next on the row.