The most successful of these movements was Bengali nationalism, which led to the creation of the Bengali-speaking nation-state of Bangladesh. The movement asserted that Urdu's official status gave an unfair advantage to Muhajirs (most of whom speak Urdu as their mother tongue) and Punjabis (whose mother tongue, Punjabi, is similar to Urdu, and many of whom were educated in Urdu under British rule). Bengalis feared they would be marginalized despite their demographic strength as, at the time, the largest ethnic group of Pakistan. These grievances culminated in the secession of East Bengal (which had been part of the administrative unit of East Pakistan) and the creation of Bangladesh.
