Following a survey asking many questions about world history, 6185 students from 35 countries were asked, “What contribution do you think the country you are living in has made to world history?” They provided an estimate from 0 to 100%, where 0% indicated that the country made no contribution to world history and 100% indicated that all contributions came from the country. U.S. students provided an estimate of 30%, quite high in some regards, but modest compared to other countries (e.g., 39% by Malaysians). Country-level estimates varied widely, ranging from 11% (Switzerland) to 61% (Russia). The total estimate (summing for all countries) was 1156%. We argue that students’ exaggerated estimates provide evidence for national narcissism and may be caused by several mechanisms, such as the availability heuristic—when students think about world history, they mostly think about the history of their country and thus assume their country must be important.