The Versailles Treaty ending World War I established a new international order by creating the League of Nations and, dividing the defeated empires in Europe into a number of nation-states. The overseas empires of the defeated became League of Nations mandates, which the victorious powers administered until they were sufficiently developed for “self -determination.” Ironically, the first terrorist campaign began in a victorious power’s territory when the Irish Republican Army produced the first success in global terrorist history though it did gain all territory sought. Campaigns emerged then in other mandates and overseas territories of the victorious powers but all failed. But the Atlantic Charter drawn in World War II made the self-determination principle more obligatory by pledging that the imperial territories of the defeated powers would be freed immediately. When the war was over, the victorious powers often dissembled portions of their empires. Elements not freed largely contained conflicting ethnic elements unable to agree on how to be governed. Successful terrorist campaigns materialized in those territories, and the wave ended when the energies of governments not terrorists dissipated! But most successes were incomplete because bloody tensions between ethnic divisions in the new states persisted.
Important terrorist decisions helped their causes. The First Wave’s language tactics, strategy, and targets were changed and helped terrorists get less offensive media coverage and significant support from the international world, particularly the United Nations. They now described themselves as “freedom fighters” not terrorists. Assassination occurred rarely, violence was restricted to local territories and efforts to cooperate with group were abandoned. The police were the principal civilian element attacked, and warnings about attacks were often given to other civilians enabling them to seek safety.