The document consists of six papers dealing with major national and international issues in the 20th century. The papers were presented at a 1977 Yale University conference convened for the purpose of providing factual information on important historical issues to high school classroom teachers and encouraging the teachers to develop curriculum based upon the information. Six invited participants (professors of history and deans at Yale University) presented the papers. The document is presented in two major sections. Section I discusses three domestic issues--change in the United States from 1960 to 1975, the green revolution in United States agriculture, and prospects for continued economic growth in the United States. Section II examines three international issues--relations between the United States and China, background of the South African crisis, and American-Soviet relations. For each issue, information is presented on background of the topic, time span, social characteristics, religious and cultural influences, political factors, and implications of the issue for students and for society in general. (DB)