Comparative history is the comparison of different societies which existed during the same time period or shared similar cultural conditions.
The comparative history of societies emerged as an important specialty among intellectuals in the Enlightenment in the 18th century, as typified by Montesquieu, Voltaire, Adam Smith, and others. Sociologists and economists in the 19th century often explored comparative history, as exemplified by Alexis de Tocqueville, Karl Marx, and Max Weber.
World history or global history as a field of historical study examines history from a global perspective. It emerged centuries ago; some leading practitioners have included Voltaire (1694–1778), Hegel (1770–1831), Karl Marx (1818–1883), Oswald Spengler (1880–1936), and Arnold J. Toynbee (1889–1975). The field became much more active (in terms of university teaching, textbooks, scholarly journals, and academic associations) in the late 20th century.
It is not to be confused with comparative history, which, like world history, deals with the history of multiple cultures and nations, but does not do so on a global scale. World historians use a thematic approach, with two major focal points: integration (how processes of world history have drawn people of the world together) and difference (how patterns of world history reveal the diversity of the human experience).
Arnold Joseph Toynbee CH FBA (/ˈtɔɪnbi/; 14 April 1889 – 22 October 1975) was an English historian, a philosopher of history, an author of numerous books and a research professor of international history at the London School of Economics and King's College London. From 1918 to 1950, Toynbee was considered a leading specialist on international affairs; from 1929 to 1956 he was the Director of Studies at Chatham House, in which position he also produced 34 volumes of the Survey of International Affairs, a "bible" for international specialists in Britain.
He is best known for his 12-volume A Study of History (1934–1961). With his prodigious output of papers, articles, speeches and presentations, and numerous books translated into many languages, Toynbee was widely read and discussed in the 1940s and 1950s.