Explanation

 The One Unit scheme was dissolved on July 1, 1970.

General Yahya Khan imposed Legal Framework Order No. 1970 to end the program

and reinstate the provisional status of the Four Provinces as of August 1947.

Additional information:

The One Unit was the reorganization of the provinces of Pakistan 

Prime Minister Muhammad Ali Bogra led it on 22 November 1954

and passed on 30 September 1955

This program merged the four provinces of West Pakistan into a single province to parallel the province of East Pakistan

• West Punjab
• Sind
• NWFP
• Baluchistan