Objectives. This study examines Americans' generalized beliefs about how much the United States can trust other nations, as well as changes over time in such beliefs.

Methods. We analyze original panel survey data collected in 2001 and 2002.

Results. Although only a minority of panel respondents expressed generalized trust in other nations immediately after the terrorist attacks of September 11, 2001, even fewer expressed such trust when reinterviewed almost a year later. Social trust, political trust, and party loyalties predicted individual-level change in this form of trust from 2001 to 2002.

Conclusions. Declining trust in other nations may have important implications for public opinion and, ultimately, public policy regarding world affairs.