In historiography, periodization is the process or study of categorizing the past into discrete, quantified, and named blocks of time for the purpose of study or analysis. This is usually done to understand current and historical processes, and the causality that might have linked those events. Periodizations can provide a convenient segmentation of time, wherein events within the period might consist of relatively similar characteristics. However, determining the precise beginning and ending of any 'period' is often arbitrary, since it has changed over time and over the course of history. Systems of periodization are more or less arbitrary, yet it provides a framework to help us understand them. Periodizing labels are continually challenged and redefined, but once established, period "brands" are so convenient that many are hard to change.
History The practice of dividing history into ages or periods is as early as the development of writing, and can be traced to the Sumerian period. The Sumerian King List, dating to the second millennium BC—which for most parts is not considered historically accurate—is "periodized" into dynastic regnal eras. The classical division into a Golden Age, Silver Age, Bronze Age, Heroic Age, and Iron Age goes back to Hesiod in the 8th–7th century BC. One Biblical periodization scheme commonly used in the Middle Ages was Saint Paul's theological division of history into three ages: the first before the age of Moses (under nature); the second under Mosaic law (under law); the third in the age of Christ (under grace). But perhaps the most widely discussed periodization scheme of the Middle Ages was the Six Ages of the World, written by the early 5th century AD, where every age was a thousand years counting from Adam to the present, with the present time (in the Middle Ages) being the sixth and final age.
Background Periodizing blocks might overlap, conflict or contradict one another. Some have a cultural usage (the "Gilded Age"), others refer to prominent historical events ('the Interwar period), while others are defined by decimal numbering systems ('the 1960s', 'the 17th century'). Other periods are named from influential individuals (the 'Napoleonic Era', the 'Victorian Era', and the 'Porfiriato'). Some of these usages will also be geographically specific. This is especially true of periodizing labels derived from individuals or ruling dynasties, such as the Jacksonian Era in America, the Meiji Era in Japan, or the Merovingian Period in France. Cultural terms may also have a limited reach. Thus the concept of the "Romantic period" is largely meaningless outside the Western world of Europe and European-influenced cultures. Likewise, 'the 1960s', though technically applicable to anywhere in the world according to Common Era numbering, has a certain set of specific cultural connotations in certain countries. For this reason, it may be possible to say such things as "The 1960s never occurred in Spain". This would mean that the sexual revolution, counterculture, youth rebellion and so on never developed during that decade in Spain's conservative Roman Catholic culture and under Francisco Franco's authoritarian regime. The historian Arthur Marwick mentions that "the 1960s' began in the late 1950s and ended in the early 1970s". This was because the cultural and economic conditions that define the meaning of the period covers more than the accidental fact of a 10-year block beginning with the number 6. This extended usage is termed the 'long 1960s'. This usage derives from other historians who have adopted labels such as "the long 19th century" (1789–1914) to reconcile arbitrary decimal chronology with meaningful cultural and social phases. Eric Hobsbawm has also argued for what he calls "the short twentieth century", encompassing the period from the First World War through to the end of the Cold War.
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