The last major extension of British Indian territory took place during the time of ___?

The last major extension of British Indian territory took place during the time of ___?

برطانوی ہندوستانی علاقے کی آخری بڑی توسیع ___ کے زمانے میں ہوئی؟
Explanation

The last major of British Indian Territory took place during the time of Dalhousie.

He by his “doctrine of lapse” and on the “basis of Maladministration” .