The burden of interest payments on the national debt is becoming unsustainable for the United States. According to the Congressional Budget Office, the amount of interest on the national debt will be $714 billion in the year 2026. If the interest on the national debt is not paid, a default on the national debt will occur.A debt default would damage the full faith and credit of the United States government. The excellent credit rating of the United States government, both at home and abroad, would be ruined. Treasury securities would no longer be considered a safe and dependable asset to hold, and there may be a foreign sell-off of US securities that would drive up interest rates. A default on the national debt will trigger an economic collapse, which may prove to be worse than the Great Depression.This book explains why the United States needs a second national currency that is conceptually different from the conventional US dollar. This book also explains how this second complementary currency will successfully ward off the impending disaster of a default on the national debt.