information:highlighting, information:classification
Systems of government

India is a secular federative parliamentary republic with the prime minister as head of government. With the most populous functional democracy in world and the world's longest written constitution, India has been stably sustaining the political system it adopted in 1950 with no regime change except that by a democratic election. India's sustained democratic freedoms are unique among the world's newer establishments. Since the formation of its republic abolishing British law, it has remained a democracy with civil liberties, an active Supreme Court, and a largely independent press. India leads region in Democracy Index. It has a multi-party system in its internal regional politics whereas alternative transfer of powers to alliances of Indian left-wing and right-wing political parties in national government provide it with characteristics of a two-party state. India has been facing notable internal religious conflicts and separatism however consistently becoming more and more stable with time.

The foundation of Pakistan lies in the Pakistan movement which began in colonial India based on Islamic nationalism. Pakistan is a federal parliamentary Islamic republic and was the world's first country to adopt Islamic republic system to modify its republican status under its otherwise secular constitution in 1956. Pakistan's governance is one of the most conflicted in the world. The military rule and the unstable governments in Pakistan have become a concern for the South Asian region. Out of 22 appointed Pakistani Prime ministers, none of them have ever been able to complete a full term in office. The nature of Pakistani politics can be characterized as a multi-party system.

The unitary semi-presidential constitutional republic of Sri Lanka is the oldest sustained democracy in Asia. Tensions between the Sinhalese and the Tamils led to the emergence of the Liberation Tigers of Tamil Eelam, a separatist Sri Lankan Tamil militant group and the outbreak of the Sri Lankan Civil War. The war, which ended in 2009, would undermine the country's stability for more than two and a half decades. Sri Lanka, however, has been leading the region in HDI with per capita GDP well ahead of India, Pakistan and Bangladesh. Sri Lanka has a multi-party system, and the political situation in Sri Lanka has been dominated by an increasingly assertive ideology of Sinhalese nationalism.

Bangladesh is a unitary parliamentary republic. The law of Bangladesh defines it as Islamic as well as secular. The nature of Bangladeshi politics can be characterized as a multi-party system. Bangladesh is a unitary state and parliamentary democracy. Bangladesh also stands out as one of the few Muslim-majority democracies. "It is a moderate and generally secular and tolerant — though sometimes this is getting stretched at the moment — alternative to violent extremism in a very troubled part of the world", said Dan Mozena, the U.S. ambassador to Bangladesh. Although Bangladesh's legal code is secular, more citizens are embracing a conservative version of Islam, with some pushing for sharia law, analysts say. Experts say that the rise in conservatism reflects the influence of foreign-financed Islamic charities and the more austere version of Islam brought home by migrant workers in Persian Gulf countries.

By the 18th century, the Hindu Gorkha Kingdom achieved the unification of Nepal. Hinduism became the state religion and Hindu laws were formulated as national policies. A small oligarchic group of Gorkha region based Hindu Thakuri and Chhetri political families dominated the national politics, military and civic affairs until the abdication of the Rana dynasty regime and establishment of Parliamentary democratic system in 1951, which was twice suspended by Nepalese monarchs, in 1960 and 2005. It was the last Hindu state in world before becoming a secular democratic republic in 2008. The country's modern development suffered due to the various significant events like the 1990 Nepalese revolution, 1996–2006 Nepalese Civil War, April 2015 Nepal earthquake and the 2015 Nepal blockade by India leading to the grave 2015–2017 Nepal humanitarian crisis. There is also a huge turnover in the office of the Prime Minister of Nepal leading to serious concerns of political instability. The country has been ranked one of the poor countries in terms of GDP per capita but it has one of the lowest levels of hunger problem in South Asia. When the stability of the country ensured as late as recent, it has also made considerable progress in development indicators outpacing many other South Asian states.

Afghanistan has been a unitary theocratic Islamic emirate since 2021. Afghanistan has been suffering from one of the most unstable regimes on earth as a result of multiple foreign invasions, civil wars, revolutions and terrorist groups. Persisting instability for decades have left the country's economy stagnated and torn and it remains one of the most poor and least developed countries on the planet, leading to the influx of Afghan refugees to neighboring countries like Iran.

Bhutan is a Buddhist state with a constitutional monarchy. The country has been ranked as the least corrupt and most peaceful country in the region, with the most economic freedom, in 2016.

Maldives is a unitary presidential republic with Sunni Islam strictly as the state religion.