Are long-term U.S. government bonds risk-free?

For any debt obligation to be considered completely risk-free, investors must have full faith that the principal and interest will be paid in full and in a timely manner. The faith aspect of a debt obligation is measured by a country's credit rating. Much like an individual's credit rating is determined by his or her borrowing and repayment history, so too are governments' financial histories scrutinized.

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