Explanation:

Odisha Day, also Utkal Dibas, is celebrated on 1 April in the Indian state of Odisha in memory of the formation of the state as a separate state out of Bihar and Orissa Province with addition of Koraput and Ganjam from the Madras Presidency on 1 April 1936. After losing its political identity completely in 1568 following the defeat and demise of the last king Mukunda Dev, efforts resulted in the formation of a politically separate state under British rule on a linguistic basis on 1 April 1936.