On an inflation adjusted basis, it took the US 224 years to ...

On an inflation adjusted basis, it took the US 224 years to add the first $10 trillion in debt.
Over the last 20 years, the US has added $15 trillion in debt.
Over the next 10 years, the US is expected to add $20 trillion in debt.
By 2030, annual interest expense on US debt will cross $1 trillion.
This means 25% of US government revenue will go toward interest expense.
This is unsustainable.