Birth Order Effects and Rebelliousness: Political Activism and Involvement with Marijuana

Frank Sulloway (1996) has claimed that later-borns are more likely to rebel against the status quo than are firstborns. The two studies reported here attempt to examine more fully Sulloway's claims about rebelliousness. The studies draw on archival data from studies of high school and college students in a midwestern state between 1969 and 1982. The current studies compare the effects of birth order, gender, family size, and father's education on two self-report measures: participation in protests and demonstrations, and involvement with marijuana. The data on involvement with marijuana provided support for Sulloway's thesis that later-borns are more rebellious than firstborns, but the data on participation in protests and demonstrations did not. These mixed findings, which contribute to the ongoing debate about Sulloway's theory, are discussed.