BEGINNERS AND WINNERS - THE FATE OF INITIATORS OF INTERSTATE WARS INVOLVING GREAT-POWERS SINCE 1495

All interstate wars involving Great Powers from 1495 to 1991 are analy zed in order to investigate a controversy about the success rate of wa r initiators and factors that might have an impact on that success rat e. We find that the initiators of wars involving Great Powers won only slightly more than half the time in the 16th, 17th, and 18th centurie s, whereas they have been about twice as likely to win as targets in t he 19th and 20th centuries. The difference in success rates can appare ntly be accounted for in part by factors such as intervention on behal f of targets and the duration of wars, although these factors have the ir clearest impact only on wars in which Great Powers fight against mi nor powers. Wars involving Great Powers on both sides were more common in the earlier centuries, and the initiators of the increasingly unco mmon wars between Great Powers have won only rarely in the most recent two centuries. The absence of wars between Great Powers in the last 5 0 years might suggest that Great Powers have ''learned'' over time to avoid becoming involved in wars against each other.