These territories were ethnically mixed, with Italian, Slovenian, Croatian, Serbian and other communities. Istria, including Rijeka and parts of Dalmatia, including Zadar, had been annexed to Italy after World War I. Italian sources consider that 250,000/270,000 ethnic Italians and (some thousands of) anti-communist Slovenes and Croats, had to leave the areas in the aftermath of the conflict.[12][13][14]