I study the determinants of changes in credit spreads for U.S. dollar denominated domestic and foreign sovereign bonds using fundamentals specified by structural models to separate spreads into their credit and non-credit components. I find that the non-default portions of spreads have a component that is common for each type of debt. Further, using a vector autoregressive model, I find that domestic spreads are related to the lagged component of sovereign spreads. I also find that some proxies for liquidity are related to the common components, suggesting a liquidity-based explanation for the common component not identified by previous research.