The Punjab has a turbulent history, having been invaded, partitioned, reunited and repartitioned more times than can be counted. As a result, many ethnic groups make up the population, the largest being Indo-Aryans.
The next foreign reign was of the Mughals, who invaded in the 13th century. Mughal rule was generally regarded as a prosperous and peaceful time, after the initial upheaval of the invasion.
British sovereignty was accepted or forced in the 18th century. At the partition of India in 1947, the area was split into West Punjab (Pakistani) and East Punjab (Indian). After the collapse of the British Raj in 1947, Punjab suffered a severe amount of civil unrest.