The U.S. dollar experienced an average inflation rate of 1.78% per year between 1864 and 2016. $66 in the year 1864 is worth $963.87 in 2016.
The inflation rate in 2016 was 1.26%.
Source: The Bureau of Labor Statistics' annual Consumer Price Index (CPI), established in 1913. Inflation data from 1665 to 1912 is sourced from a historical study conducted by political science professor Robert Sahr at Oregon State University.