United States college graduates live and work in a rapidly changing and interdependent society (Benson et al., 2017; Komives & Wagner, 2017). Technological and other innovations make it possible for individuals to connect across international borders more than any other time in history (Milanovic, 2013; United Nations Human Development Program, 2020). Higher education institutions (HEIs) in the United States historically functioned to prepare the next generation for leadership in society (Benson et al., 2017; Bok, 2013; Geiger, 2019). In the 21st century, U.S. HEIs encounter increasing pressure to prepare undergraduate students for life after college in an interdependent society (Benson et al., 2017; Bok, 2013). International service-learning (ISL) is a high-impact educational practice that correlates with personal and societal change (Bringle et al., 2011; Reid, 2018). Despite evidence of a transformative effect, few U.S. college students participate in ISL as undergraduates (Bringle et al., 2011; Institute of International Education, 2020). There is limited research on recent U.S. college graduates' perspectives on the influence of their undergraduate ISL experiences on their lives after college (Buschlen & Warner 2014; Candiff, 2015; Haines et al., 2017; Kiely, 2004, 2005; McNamara, 2012; Reid, 2018). This qualitative, phenomenological study examined the perceived effect of participation in undergraduate ISL on recent U.S. college graduates' post-college readiness through the lens of Mezirow's (1991, 2000) transformative learning theory. Findings indicate that ISL is a transformative educational experience for college undergraduates. Participants engaged in self-examination, dialogue, and skill development through an ISL experience, which resulted in changes that influenced their professional and personal lives after college. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]