In a landmark book called "The Trouble with Textbooks," Dr. Gary A. Tobin and Dennis R. Ybarra show how some American textbooks contain anti-Semitic versions of Jewish history and faith, particularly in relation to Christianity and Islam. The authors found that some U.S. textbooks "tend to discredit the ties between Jews and the Land of Israel. Israel is blamed for starting wars in the region and being colonialist. Jews are charged with deicide in the killing of Jesus. All in all, there are repeated misrepresentations that cross the line into bigotry."