Interesting writeup on Toynbee, who wrote about world history:
http://en.wikipedia.org/wiki/Arnold_J._Toynbee
Toynbee's ideas and approach to history may be said to fall into the discipline of Comparative history. While they may be compared to those used by Oswald Spengler in The Decline of the West, he rejected Spengler's deterministic view that civilizations rise and fall according to a natural and inevitable cycle.
For Toynbee, a civilisation might or might not continue to thrive, depending on the challenges it faced and its responses to them.
Toynbee presented history as the rise and fall of civilizations, rather than the history of nation-states or of ethnic groups. He identified his civilizations according to cultural or religious rather than national criteria. Thus, the "Western Civilization", comprising all the nations that have existed in Western Europe since the collapse of the Roman Empire, was treated as a whole, and distinguished from both the "Orthodox" civilization of Russia and the Balkans, and from the Greco-Roman civilization that preceded it.
With the civilizations as units identified, he presented the history of each in terms of challenge-and-response. Civilizations arose in response to some set of challenges of extreme difficulty, when "creative minorities" devised solutions that reoriented their entire society. Challenges and responses were physical, as when the Sumerians exploited the intractable swamps of southern Iraq by organizing the Neolithic inhabitants into a society capable of carrying out large-scale irrigation projects; or social, as when the Catholic Church resolved the chaos of post-Roman Europe by enrolling the new Germanic kingdoms in a single religious community. When a civilization responds to challenges, it grows. Civilisations declined when their leaders stopped responding creatively, and the civilisations then sank owing to nationalism, militarism, and the tyranny of a despotic minority (see mimesis). Toynbee argued that
"Civilizations die from suicide, not by murder." For Toynbee, civilizations were not intangible or unalterable machines but a network of social relationships within the border and therefore subject to both wise and unwise decisions they made.
He expressed great admiration for Ibn Khaldun and in particular the Muqaddimah, the preface to Ibn Khaldun's own universal history, which notes many systemic biases that intrude on historical analysis via the evidence.