Apart from the great answers already here: Nationalism and Colonialism.
When modern states came up, stories of the past became standardized and there was demand to understand it better – and with it funding for archeology. National-archeology was quite prominent. Added to that, colonialism created unforeseen access to historical sites of foreign areas – with British, French, German archeologists taking huge amounts of artifacts. Which would have been impossible both politically and logistically prior to the 19th century.
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