- Invasion theory
Invasion theory or Invasionism is a method of explaining changes in past societies that relies on the idea of external conquest to provide the catalyst for new ideas appearing in a
culture, cite book| last = Smith| first = Anthony D. | title = The Concept of Social Change: A Critique of the Functionalist Theory of Social Change| publisher = Routledge | date = 1973| pages = 157-158| url = http://books.google.com/books?id=h649AAAAIAAJ&pg=PA157&dq=invasionism&sig=UpCBKVJZF613PxRFTqkHXzm-X5o#PPA157,M1| isbn = 071007607X ] for example, the arrival of novel artefact types or building styles appearing in the material record.
Invasionism was a popular approach to explaining social change amongst
archaeologists until the 1960s when approaches that treated prehistory as being less bellicose were increasingly adopted, such as migrationism. [ cite book | last = McNiven| first = Ian J. | coauthors = Lynette Russell| title = Appropriated Pasts: Indigenous Peoples And The Colonial Culture Of Archaeology| publisher = Rowman Altamira| date = 2005| pages = 100-101| url = http://books.google.com/books?id=fIi39gyQ8YcC&pg=PA100&dq=migrationism+invasionism&sig=oGBPGU0OpHvy8pBrGb58GHfldgU#PPA100,M1| isbn = 0759109079 ]
It is connected with early twentieth century ideas of
diffusionismand hyper-diffusionismwhich often hinged on Biblical mass folk movements and successive waves of invaders providing infusions of new ideas in different regions.
Although the approach has generally been superseded it is still applicable in certain cases. However its application is treated to much more scrutiny that it was previously and such theories now require concrete proof rather than being given an assumption of veracity.
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