The system of the Subsidiary Alliance was used to extend British control over Indian states by

Lord Wellesley (1798 to 1805) forced Indian rulers such as the Nizam and the Peshwa to keep British troops at their own cost, accept a Resident, and give up foreign relations. Dalhousie annexed states under the Doctrine of Lapse, Curzon is associated with the Partition of Bengal, and Cornwallis with administrative and revenue reforms.