This study of 4,057 students from 52 high schools in Chicago examines the impact of civic learning opportunities on students' commitments to civic participation. The study controls for demographic factors, pre-existing civic commitments, and academic test scores. Unlike prior large scale studies that found limited impact from school based civic education, but often did not focus on what and how students were taught, the focus is on a set of specific civic learning opportunities and it is found that they foster notable improvements in students' commitments to civic participation. Discussing civic and political issues with one's parents, extra-curricular activities other than sports, and living in a civically responsive neighborhood also appear to meaningfully support this goal. Other school characteristics appear less influential. (Contains 5 tables.)