Federal debts have grown due to persistent budget deficits. Simply put, when the government spends more money than it gains from tax revenue and other sources, there is a budget deficit. Such deficits add to the public debt as funds must be borrowed in order for all components of the budget to be covered.
Public debt is also costly to the public, as interest payments absorb government resources that could otherwise be used for additional public services. A look at the interest expense on public debt in the United States shows that interest on public debt totaled 574 billion U.S. dollars in 2019. That is more than double the federally allocated funding for education and related programs.
Due to this persistent financial outlay, high levels of public debt are seen as being restrictive on growth and the economy as a whole. As such, countries generally try to keep their level of public debt down. The United States has the unfortunate accolade of being included in the 20 countries in the world with the highest public debt to gross domestic product ratio. Moreover, high levels of public debt can also lead to deep financial crises, as the experience of the Greek economy has shown.