sentences:  The main zones of war were the territories inhabited by the Hungarians, so the death toll depleted them much faster than other nationalities.The three parts of Hungary; the Habsburg Hungary, Ottoman Hungary and Transylvania, experienced only minor differences in population increase in the 17th century.According to data presented in the most authoritative studies, the collective population of all three regions grew from about 3.5 million inhabitants at the close of the 16th century to about 4 million by the close of the 17th century.