Pakistan gained independence from British rule in 1947. It was formed as a separate Muslim state for Muslims in South Asia in response to fears that Muslims would be marginalized in a united India. Pakistan has a population of over 169 million, with Islam being the dominant religion. Urdu is the national language, though English is also widely used. Northern Pakistan is mountainous, while the south is more fertile. Pakistan has a semi-presidential system with an elected president as head of state and an elected prime minister as head of government. Major holidays include Independence Day on August 14th and Defense Day, which commemorates the military's role in defending the nation.