The purpose of this project was to gain a better understanding of dimensions of trust and inter-relationships between those dimensions during the adolescent years. Drawing from survey data collected at the beginning and end of a semester in eighty middle- and high-school social studies classes, relationships were assessed between: social trust, trust in elected officials, trust in the responsiveness of government to ordinary people, trust in the American promise, and trustworthiness of the media. The study was designed as a randomized evaluation of a civics curriculum called Student Voices in the Campaign, with data gathered from two waves of surveys with 1,670 students ages 12-19 during the fall of 2004. Students from ethnic minority backgrounds were less likely than their ethnic majority peers to trust elected officials or people in general or to believe that the government was interested in ordinary people. However, ethnic minority students were not less likely to believe in the general tenets of that all people, regardless of background, had an equal opportunity to succeed in America. Controlling for social class, age, and ethnicity, adolescents' trust in the American promise and their civic commitments were found to be significantly predicted by the youths' proximate experiences of social inclusion in their communities and, particularly for ethnic minority students) by their reports that teachers practiced a democratic ethos at school. (Contains 9 tables.)