Government and politics of Pakistan

The government of Pakistan was based on the Government of India Act (1935) for the first nine years after independence. The first Constitution of Pakistan was adopted in 1956, but was suspended in 1958 by General Ayub Khan. The Constitution of 1973—suspended in 1977, by Zia-ul-Haq, but re-instated in 1991—is the country's most important document, laying the foundations of government. Pakistan is a semi-presidential federal democratic republic with Islam as the state religion. The bicameral legislature comprises a 100-member Senate and a 342-member National Assembly. The President is the Head of State and the Commander in Chief of the Armed Forces and is elected by an electoral college. The prime minister is usually the leader of the largest party in the National Assembly. Each province has a similar system of government with a directly elected Provincial Assembly in which the leader of the largest party or alliance becomes Chief Minister. Provincial Governors are appointed by the President.

Prime Minister Yousuf Raza Gilani
The Pakistani military has played an influential role in mainstream politics throughout Pakistan's history, with military presidents ruling from 1958–71, 1977–88 and from 1999–2008. The leftist Pakistan Peoples Party, led by Zulfikar Ali Bhutto, emerged as a major political player during the 1970s. Under the military rule of Muhammad Zia-ul-Haq, Pakistan began a marked shift from the British-era secular politics and policies, to the adoption of Shariat and other laws based on Islam. During the 1980s, the anti-feudal, pro-Muhajir Muttahida Qaumi Movement (MQM) was started by unorthodox and educated urban dwellers of Sindh and particularly Karachi. The 1990s were characterized by coalition politics dominated by the Pakistan Peoples Party and a rejuvenated Muslim League.
In the October 2002 general elections, the Pakistan Muslim League (Q) (PML-Q) won a plurality of National Assembly seats with the second-largest group being the Pakistan Peoples Party Parliamentarians (PPPP), a sub-party of the PPP. Zafarullah Khan Jamali of PML-Q emerged as Prime Minister but resigned on 26 June 2004 and was replaced by PML-Q leader Chaudhry Shujaat Hussain as interim Prime Minister. On 28 August 2004 the National Assembly voted 191 to 151 to elect the Finance Minister and former Citibank Vice President Shaukat Aziz as Prime Minister. The Muttahida Majlis-e-Amal, a coalition of Islamic religious parties, won elections in North-West Frontier Province, and increased their representation in the National Assembly - until their defeat in the 2008 elections.

Prime Minister's Secretariat, Islamabad
Pakistan is an active member of the United Nations (UN) and the Organisation of the Islamic Conference (OIC), the latter of which Pakistan has used as a forum for Enlightened Moderation, a plan to promote a renaissance and enlightenment in the Muslim world. Pakistan is also a member of the South Asian Association for Regional Cooperation (SAARC) and the Economic Cooperation Organisation (ECO). In the past, Pakistan has had mixed relations with the United States; in the early 1950s, Pakistan was the United States' "most allied ally in Asia"[25] and a member of both the Central Treaty Organisation (CENTO) and the Southeast Asia Treaty Organisation (SEATO). During the Soviet-Afghan War in the 1980s Pakistan was a major U.S. ally. But relations soured in the 1990s, when sanctions were applied by the U.S. over suspicions of Pakistan's nuclear activities. However, the 11 September 2001 attacks and the subsequent War on Terrorism led to an improvement in U.S.–Pakistan ties, especially after Pakistan ended its support of the Taliban regime in Kabul. This was evidenced by a major increase in American military aid, providing Pakistan $4 billion more in three years after the 9/11 attacks than before.[26]
On 18 February 2008, Pakistan held its general elections after Benazir Bhutto's assassination postponed the original date of 8 January 2008.[27] The Pakistan Peoples Party won the majority of the votes and formed an alliance with the Pakistan Muslim League (N). They nominated and elected Yousaf Raza Gilani as Prime Minister of Pakistan.[28] On 18 August 2008, Pervez Musharraf resigned as President of Pakistan amidst increasing calls for his impeachment.[29] In the presidential election that followed, Asif Ali Zardari of Pakistan People's Party won by a landslide majority and became President of Pakistan.