Firstly this issue goes way beyond my knowledge and ability to do so but I'll do the best I can.

Alright after the Civil War the United States had significant troubles in needing to rebuild itself and so made a "deal with the devil" with banking institutions of London (most prominently the Rothchilds). But if they were to help provide funds the war torn nation it required several stipulation.

1. The elimination of Greenbacks that Lincoln implemented which heavily competed with profits of banking institutions and helped fund the government to a surprisingly successful degree.
2. The turning of America into a corporation with the Act of 1871 along with the slow erosion of the US Constitution with formation of District of Columbia without any constitutional authority of Congress to do so. By doing so it is one of the beginn
3. Formation of Corporation Act of 1870 which goes hand and hand with #2. In addition it allows the US Government to charter corporations which originally goes beyond its authority to do so. There are many others I have not listed as well, the above 3 are what come to mind however for me most prominently.

Abraham Lincoln during the war knew of this threat however of bankers however he died in 1865 thus allowing Banking Institutions an opportunity to capitalize on.