Below is something that I used for a paper, so I just left citations and added sources at the bottom. Not sure how formal you want this to be, but I figured that more info is better so I added sources
Prior to the mid 20th century bhangra was not a dance common to the entire Punjab region (Ballantyne 128). Rather, it was limited to only a select few Punjabi villages, primarly in west Punjab. The partition of India in 1947 split Punjab into two, with east Punjab becoming part of Pakistan and west Punjab becoming part of India. As the region underwent drastic changes, the dance changed dramatically as well and found a new home: the stage. Partition forced millions across the Indo-Pak border, and many refugee camps sprung up in Punjab. In part, these camps became places for Punjabis to share their respective folkdances. Those from west Punjab introduced bhangra to their east Punjabi counterparts while others performed their own regional folkdances, including luddi, jhummar, dhamaal, phumnia, and many others (Ballantyne 128).
These refugees eventually formed the first formal bhangra team and performed for Prime Minister Jawaharlal Nehru at the Kurukshetra camp in India in April 1948 (Ballantyne 129). This team, however, did not perform bhangra in its original form. Rather, the dancers performed a combination of the aforementioned folkdances from various parts of Punjab. The government of Punjab looked at the dance “as an emblem of a distinctive Punjabi identity within independent India,” as Tony Ballantyne describes in
Between Colonialism and Diaspora: Sikh Cultural Formations in an Imperial World (Ballantyne 129). This dance would be popularly referred to as bhangra for the first time when a Punjabi-government-sponsored team performed at the Republic Day Parade in New Delhi in 1954 (Dhillon 89).
Ballantyne, Tony.
Between Colonialism and Diaspora: Sikh Cultural Formations in an
Imperial World. Durham, NC: Duke University Press, 2006.
Dhillon, Iqbal Singh.
Folk Dances of Panjab. Chandni Chowk, Delhi: National Book Shop, 1998.[SIZE=78%] [/SIZE]