World History

There are varieties of ways in which history can be organized, including chronologically, culturally, territorially, and thematically. These divisions are not mutually exclusive, and significant overlaps are often present, as in "The International Women's Movement in an Age of Transition, 1830–1975." It is possible for historians to concern themselves with both the very specific and the very general, although the modern trend has been toward specialization. The area called Big History resists this specialization, and searches for universal patterns or trends. History has often been studied with some practical or theoretical aim, but also may be studied out of simple intellectual curiosity.
History and prehistory
The history of the world is the memory of the past experience of Homo sapiens sapiens around the world, as that experience has been preserved, largely in written records. By "prehistory", historians mean the recovery of knowledge of the past in an area where no written records exist, or where the writing of a culture is not understood. Human history is marked both by a gradual accretion of discoveries and inventions, as well as by quantum leaps — paradigm shifts, revolutions — that comprise epochs in the material and spiritual evolution of humankind. By studying painting, drawings, carvings, and other artifacts, some information can be recovered even in the absence of a written record. Since the 20th century, the study of prehistory is considered essential to avoid history's implicit exclusion of certain civilizations, such as those of Sub-Saharan Africa and pre-Columbian America. Historians in the West have been criticized for focusing disproportionately on the Western world. In 1961, British historian E. H. Carr wrote: