This report from the 2018 Cardus Education Survey examines the school sector effect on the social ties of graduates of nongovernmental and public schools in the U.S. It is based on a representative survey of 1500 randomly selected American high school graduates (ages 24-39). The Cardus Education Survey includes a large number of controls for many factors in student development such as parental education, religion, and income, to isolate a school sector’s particular impact. This report measures the strength and diversity of the social ties held by American graduates and the influence of the various school sectors on these social outcomes.