I can think of no word that can be used as a precise antonym of 'founded' in such contexts as:
The school was founded in 1732.
The USA is a nation founded on certain ideals.
Indeed, I can't think of an antonym of 'founded' in many contexts.
Possibly 'dissolved' works in "The monasteries were founded in the eleventh and twelfth centuries and dissolved in the sixteenth.
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