Question

what is doctrine of lapse

Answer 1

doctrine of lapse was an policy applied by the East India Company to expand the kingdom of British which was based on the idea that in case a ruler of dependent state died childless, the right of ruling over the state lapsed to the sovereign.
it was the policy of Dalhousie.

Answer 2

Hey!!!
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>>doctrine of lapse was a law passed by lord Dalhousie ( the governor general of india in 1848 )

in this law, If any ruler died without leaving behind any natural heir to The Throne his Kingdom automatically became a part of the British territory.

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