Each group desired, and continues to desire, that its moral education be rooted in its respective faith or code. Horace Mann, the nineteenth-century champion of the common schools, strongly advocated for moral education. He and his followers were worried by the widespread drunkenness, crime, and poverty during the Jacksonian period they lived in. No less troubling were the waves of immigrants flooding into cities, unprepared for urban life and particularly unprepared to participate in democratic civic life. The most successful textbooks during the nineteenth and early twentieth centuries were the famed McGuffey Readers, fostering virtues such as thrift honesty, piety, punctuality and industry. McGuffey was a theological and conservative teacher and attempted to give schools a curriculum that would instill Presbyterian Calvinist beliefs and manners in their students. Mid-twentieth century During the late-nineteenth-century and twentieth-century period, intellectual leaders and writers were deeply influenced by the ideas of the English naturalist Charles Darwin, the German political philosopher Karl Marx, the Austrian neurologist and founder of psychoanalysis Sigmund Freud, and by a growing strict interpretation of the separation of church and state doctrine. This trend increased after World War II and was further intensified by what appeared to be changes in the nation's moral consensus in the late 1960s. Educators and others became wary of using the schools for moral education. More and more this was seen to be the province of the family and the church. Still, due to a perceived view of academic and moral decline, educators continued to receive mandates to address the moral concerns of students, which they did using primarily two approaches: values clarification and cognitive developmental moral education. Values clarification. Values change over time in response to changing life experiences. Recognizing these changes and understanding how they affect one's actions and behaviors is the goal of the values clarification process. Values clarification does not tell you what you should have, it simply provides the means to discover what your values are. This approach, although widely practiced, came under strong criticism for, among other things, promoting moral relativism among students. Cognitive-developmental theory of moral education and development sprang from the work of the Swiss psychologist Jean Piaget and was further developed by Lawrence Kohlberg. Kohlberg rejected the focus on values and virtues, not only due to the lack of consensus on what virtues are to be taught, but also because of the complex nature of practicing such