A large current account deficit is the result of an imbalance between exports and imports.
Second, the USA also has massive debt obligations with current government debt of 14.6 Trillions (Source: Debt Clock) excluding unfunded liabilities. That debt represented 92.7% of GDP in 2010 according to the IMF, and is close to 100% now. Some historical studies (cf. "Growth in a Time of Debt", Reinhart and Rogoff)explain that when a country debt to GDP is over 90%, the likelihood of paying down the debt decreases significantly as it affects economic growth rates negatively.
There are no clear number for unfunded liabilities, as the total debt varies between 60 Trillions and 115 Trillions. But consider this: The total net worth of households and non-profit organizations in the US amount to less than 60 Trillions as of today (See Business Insider Chart below).
Such a large amount of debt will never be repaid, and the US has few options: