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The changes of a nation's external debt are the main external manifestations of economy, namely foreign trades and international capital flows. The sustainability of American external debt is, in a certain degree, determined by the continuous external imbalance in American economy. In essence, there is a close relationship between the aggravation of the external and internal imbalance in American economy. The empirical analysis shows that no matter how the USA's economic status is, the inter-conversion between fiscal gap and savings- investment gap of private sector result in the continuous expansion of American external debt and moreover ensure the sustainability of American external debt.

Study on Sustainability of American Double Gaps and its External Debt