The history of peace can be divided into three broad periods. The first era, which lasted until about 4000BC, is the Long Peace of Prehistory. By the end of it, ___ had been developed but writing hadn't.

Peace studies is an interdisciplinary academic field that draws on political science, sociology, history, anthropology, theology, psychology, philosophy, and other fields to:

understand the causes of armed conflict;
develop ways to prevent and resolve war, genocide, terrorism, gross violations of human rights; and
build peaceful and just systems and societies.