As of 2012, the United States currently has ~16 trillion in debt. 

The last five presidents have all added to the overall debt\*. 

Who is the last US president to decrease the total amount of debt owed by the Federal government?

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\*(Including Bill Clinton; it is a common misconception that he paid down debt. He paid down some of the public debt, but the amount of intra-governmental debt increased offsetting the gains he made in paying off the public debt)