I believe the answer is inflation.
Inflation- rising prices due to an increase in the supply of money
If the national debt continues its trend of the past decade, people will be most likely to see an increase in their tax rates. In order to compensate for the cost of the rising national debt, the government will likely be forced to raise federal income and sales tax in order to generate the needed additional revenue.
They grew by their culture
-corrupt treaties and <span>-foreign imperialism</span>