The Punjab States Agency administered around 40 Indian princely states in northwest India that was earlier under the control of the British province of the Punjab. In the year 1936, the Punjab Hill States Agency was formed out of the region. The native states were put under the suzerainty of the British East India Company after the Anglo Nepalese War of 1814- 1816. These were then renamed as the Shimla Hill States, which included a number of Princely States of India that were situated in the hilly regions during the reign of the British Empire in India. Later, the territory came under the control of the British province of Punjab, excluding the Tehri Garhwal region, as it under the control of the United Provinces.
After the country achieved independence and the partition of India in 1947, most of the princely states incorporated in the Punjab Hill States Agency was acceded to the Union of India, while the rest of the states acceded to the Dominion of Pakistan. Several of these states formed the new Indian state of Himachal Pradesh, while the territory of Tehri Garhwal was included as a part of Uttar Pradesh. In the year 2000, the northern part of the state of Uttar Pradesh, which also included the erstwhile state of Tehri Garhwal, became the new Indian state of Uttarakhand.