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When did Himachal Pradesh become a state of India?

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Steep, green slopes with dense trees rise on both sides of a narrow valley in Kullu Valley, Himachal Pradesh, India, with mist and clouds partially obscuring the peaks. — Himachal Pradesh The valley of the gods, Kullu Valley, central Himachal Pradesh, India.

Himachal Pradesh officially became the 18th state of India on January 25, 1971.12

Prior to achieving full statehood, the region underwent several administrative transitions. It was first constituted as a province in 1948, became a substate under the Indian constitution in 1950, and was designated a union territory in 1956. Following the merger of various Punjab hill areas in 1966, the region was eventually granted full statehood, with Y.S. Parmar serving as its first chief minister.12