What bank in Chicago will trade foreign money for US Dollars?

Yes, with exceptions. Many US banks will change foreign currency into US dollars, but the less proportion that activity is for the bank then the higher the fee over the actual international exchange...

Yes - Banks usually have a foreign exchange counter.

Some banks do and others do not. Depends on the bank and the currency. When I got back from Russia I still had about 500 rubles and wanted to exchange them at my bank, but they wouldn't take them....

You can get US dollars for Ghana money at a money exchange store which can be found at the borders or maybe near you.

no, you have to convert it to US money, which you can probably do at any customs office