In 1902, it was established as the United Provinces of Agra and Oudh during the British rule.
Post-independence, the United Provinces became an administrative unit in 1947 and the princely states of Tehri Garhwal and Rampur were merged into it by 1949.
Finally, on January 24, 1950, the state was renamed Uttar Pradesh.
But the Uttar Pradesh Day was first celebrated in 1989.
In 2000, the hilly areas were carved out to create a new state, originally named Uttaranchal, later renamed Uttarakhand.