After the breakup of Yugoslavia occurred as a result of a series of political upheavals and conflicts during the early 1990s, conservative politician President Franjo Tuđman rose to power in, on October 8, 1991, newly established Republic of Croatia. Israel has complained about the attitude that Tuđman presented in his book "The Wastelands of Historical Reality", more specifically in the chapter entitled ""The history of the multiplication of war crimes and the creation of the Jasenovac and Bleiburg myth"" in which he questioned the number of people killed in Jasenovac concentration camp considering that the number was from 30,000 to 40,000, unlike much higher figures presented by the Yugoslav authorities which emphasized a range between 350,000 and 800,000. The United States Holocaust Memorial Museum (USHMM) presently estimates that the Ustaša regime murdered between 77,000 and 99,000 people in Jasenovac between 1941 and 1945, out of which 12,000 to 20,000 were Jews. The Jasenovac Memorial Site quotes a similar figure of between 80,000 and 100,000 victims. Tuđman was also writing about the cooperation of some Jewish inmates with Nazi supervisors in Jasenovac, which he based on the memoirs written by the Croatian Communist Ante Ciliga who spent a year as a prisoner in Jasenovac.