Query: When did Himachal Pradesh become a union territory?
Context: Legislative Assembly was elected in 1952. Himachal Pradesh became a union territory on 1 November 1956. Following area of Punjab State namely Simla, Kangra, Kulu and Lahul and Spiti Districts, Nalagarh tehsil of Ambala District, Lohara, Amb and Una kanungo circles, some area of Santokhgarh kanungo circle and some other specified area of Una tehsil of Hoshiarpur District besides some parts of Dhar Kalan Kanungo circle of Pathankot tehsil of Gurdaspur District; were merged with Himachal Pradesh on 1 November 1966 on enactment of Punjab Reorganisation Act, 1966 by the Parliament.