I know how you can take care of Iran.
Instate a dictator in a country right next door (probably Iraq since it's now yours) to invade them...you know, get the banks to loan him lots of money would boost the economy as well, and then he could use that money to buy old shitty weapons you can't sell.
That way he'll be able to fight Iran, but can't fight you because he owes you money and you have better weapons anyway, and his country could need water supplies and construction services American corporations could sell him such as Halliburton and Bechtol.
However, you have to make sure he wins, otherwise Iran will get super pissed off (again) and Iraq might invade Kuwait. Which we dont want because the amount of oil the UK and the USA get from that country is not only the reason we're so powerful, but also the reason Iran is pissed off at us in the first place! If that happens, you might have to start Iraq all over again.
Yo Saddam, Imma let yo finish, but Castro is the best dictator of all time!