This course is an introduction to the nature of ideology, which is continued by discussing the importance of the basis of the state for a country as well as the relationship between ideology and the basis of the state, followed by discussing the world‘s major ideologies. Then it is deepened by discussing the state foundations of the countries: Indonesia (Pancasila), United States, England, France, Russia, Germany and the Netherlands which can be studied from the constitutional system or constitution of the country. And in the end, students have the belief that Pancasila is the best state foundation and is suitable for the Indonesian nation and state. Lectures are carried out using a system of case study analysis, presentations and discussions, problem solving tasks, and reflection.