The British began to exert colonial control of Nigeria in the early 20th century. At that time, much of Plateau State was part of Bauchi Province. In 1926, Plateau Province, made up of Jos and Pankshin Divisions, was carved out of Bauchi. The border changed several times in subsequent years as the government sought not to split ethnic groups. In May 1967, Benue and Plateau Provinces were merged to form the large Benue-Plateau State. At this time Nigeria had twelve states.