Covering Section 3 of the Irish Junior Certificate syllabus, this book examines social and political changes in the 20th century. International relations in the 20th century are examined as is Irish political development in the late 19th and 20th centuries. There is also a section on social change in the 20th century, where the USA has been chosen as a contrasting society to Ireland and a thematic approach has been adopted. The book includes extracts from primary documentary sources, followed in each case by questions. Within each chapter there are questions designed to assess the student's comprehension. At the end of each chapter a review of the main points offers a source of revision. The book covers the full course for Higher Level students as outlined in the Junior Certificate syllabus. The section on International Relations - the first section in the book - must be studied by both Higher and Ordinary level students.