The political history of the world is the history of the various political entities created by the human race throughout their existence and the way these states define their borders. Throughout history, political systems have expanded from basic systems of self-governance and monarchy to the complex democratic and totalitarian systems that exist today. In parallel, political entities have expanded from vaguely defined frontier-type boundaries, to the national definite boundaries existing today.
Prehistory
The primate ancestors of human beings already had social and political skills. The first forms of human social organization were families living in band societies as hunter-gatherers.
After the invention of agriculture around the same time (7,000-8,000 BCE) across various parts of the world, human societies started transitioning to tribal forms of organization.
There is evidence of diplomacy between different tribes, but also of endemic warfare. This could have been caused by theft of livestock or crops, abduction of women, or resource and status competition.
The Three-age system of periodization of prehistory was first introduced for Scandinavia by Christian Jürgensen Thomsen in the 1830s. By the 1860s, it was embraced as a useful division of the "earliest history of mankind" in general and began to be applied in Assyriology. The development of the now-conventional periodization in the archaeology of the Ancient Near East was developed in the 1920s to 1930s.
Ancient history
The early distribution of political power was determined by the availability of fresh water, fertile soil, and temperate climate of different locations. These were all necessary for the development of highly organized societies. The locations of these early societies were near, or benefiting from, the edges of tectonic plates. the Indus Valley Civilization was located next to the Himalayas (which were created by tectonic pressures) and the Indus and Ganges rivers, which deposit sediment from the mountains to produce fertile land.
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In political science and political history, the term power vacuum, also known as a power void, is an analogy between a physical vacuum to the political condition "when someone in a place of power, has lost control of something and no one has replaced them." The situation can occur when a government has no identifiable central power or authority. The physical analogy suggests that in a power vacuum, other forces will tend to "rush in" to fill the vacuum as soon as it is created, perhaps in the form of an armed militia or insurgents, military coup, warlord or dictator.
International relations (1919–1939) covers the main interactions shaping world history in this era, known as the interwar period, with emphasis on diplomacy and economic relations. The coverage here follows the diplomatic history of World War I and precedes the diplomatic history of World War II.
thumb|280px|Signature du traité de Versailles dans la galerie des Glaces du château de Versailles en 1919. Les conséquences de la Première Guerre mondiale sont généralement considérées comme catastrophiques. Près de 9,7 millions de militaires ont été tués, sur 74 millions de soldats mobilisés ; 8,9 millions de civils ont péri, 21 millions de personnes ont été blessées du fait de ce conflit. Des changements politiques, culturels et sociaux radicaux ont affecté l'Europe, l'Asie, l'Afrique, et même des zones qui n’avaient pas été directement impliquées.