REA's Essentials provide quick and easy access to critical information in a variety of different fields, ranging from the most basic to the most advanced. As its name implies, these concise, comprehensive study guides summarize the essentials of the field covered. Essentials are helpful when preparing for exams, doing homework and will remain a lasting reference source for students, teachers, and professionals. Political Science covers the major political developments that have shaped the American government today. Includes ancient theories such as Secularism, and modern theories such as Marxism. This book also explains the principles of the constitution and the structure of the American judicial system. Also reviews international relations such as international law and foreign policies. An excellent source book for political studies.