This report of findings is designed as an initial sketch of some of the political attitudes and values of American High School Seniors at a particular point in historical time and at a single stage in their political development. In the spring of 1965 a national probability sample of 1669 high school seniors at 97 high schools were interviewed in-depth; a random sample of their parents, social studies teachers, and school principals were also interviewed. In addition, all members of the senior class in a majority of the schools completed an abbreviated self-administered questionnaire. Through 1968 the data were examined to determine political orientation as well as to assess the relative impact of family, school, and community on political learning. Part I of the report examines the sample to determine: 1) the breadth of the social studies curriculum in American High Schools; and, 2) the extent and sources of variability in course exposure and impact. Part II presents a political portrait of the students in the individual schools and compares them with those of students in the nation as a whole. The national sample is divided into two sets of sub-groups to examine the differences among students: 1) located in different regions of the country; and, 2) having different educational aspirations. (Author/SBE)