Focusing on America from 1900 to the present, the major social, political, and economic developments in this century are presented in this course for grades 11 and 12. Large and small groups, panel discussions, and individual and group reports are all employed, with an emphasis on research techniques. Each student selects a major problem in 20th century America and does an in-depth research project on his topic, including its background, causes, and possible solutions. The course of study contains three sections: Overview, Units, and Materials. The overview presents the philosophy, major course objectives, samples of student handouts using the inquiry approach, a course description, major units, schedule of the year-long course, books to be used in the course, and pre and post test. Six units are outlined: The Rise of Industrialism, Reform in America, The U. S. Becoming a World Power, the Golden Twenties, the New Deal and World War II, and the Challenges of a New Era. A simulation list, two simulation games, and a book, film, and audiovisual list conclude the course of study. (KSM)