With the antagonism between anti-interventionist Marxists and pro-interventionist Fascists complete by the end of the war, the two sides became irreconcilable. The Fascists presented themselves as anti-Marxists and as opposed to the Marxists. Mussolini tried to build his popular support especially among war veterans and patriots by enthusiastically supporting Gabriele D'Annunzio, the leader of the annexationist faction in post-war Italy, who demanded the annexation of large territories as part of the peace settlement in the aftermath of the war. For D'Annunzio and other nationalists, the city of Fiume in Dalmatia (present-day Croatia) had "suddenly become the symbol of everything sacred." Fiume was a city with an ethnic Italian majority, while the countryside around it was largely ethnic Croatian. Italy demanded the annexation of Fiume and the region around it as a reward for its contribution to the Allied war effort, but the Allies – and US president Woodrow Wilson in particular – intended to give the region to the newly formed Kingdom of Serbs, Croats and Slovenes (later renamed Yugoslavia).