This study of the Constitution of the United States carefully explains and comments on its preamble, main body and amendments so that readers may fully understand what it means to us today. This revised and updated edition covers all the changes that have been made in the structure of the federal government since the original publication of the book. This is the ideal introduction to a document that remains as relevant today as when it was first drafted over two hundred years ago. The book includes a complete study apparatus to aid the student and may be used to supplement any U.S. history course or independently as a civics course.