This is the purchasing power of the US Dollar since the passage of the Mint Act in 1792.
(click on chart to enlarge)
The current US Fed (central bank) was started in 1913, ironically the same year the income tax was started. The US had 2 other central banks during the 1800s but only for short periods of time. No wonder the US Fed is illegal, unconstitutional. Look at what it did to the purchasing power of the US Dollar.