The people of India have had a continuous civilization since 2500 B.C., when the inhabitants of the Indus River valley developed an urban culture based on commerce and sustained by agricultural trade. This civilization declined around 1500 B.C., probably due to ecological changes.

During the second millennium B.C., pastoral, Aryan-speaking tribes migrated from the northwest into the subcontinent, settled in the middle Ganges River valley, and adapted to antecedent cultures.

The political map of ancient and medieval India was made up of myriad kingdoms with fluctuating boundaries. In the 4th and 5th centuries A.D., northern India was unified under the Gupta Dynasty. During this period, known as India's Golden Age, Hindu culture and political administration reached new heights.

Islam spread across the subcontinent over a period of 700 years. In the 10th and 11th centuries, Turks and Afghans invaded India and established sultanates in Delhi. In the early 16th century, Babur, a Turkish adventurer and distant relative of Timurlane, established the Mughal Dynasty, which lasted for 200 years. South India followed an independent path, but by the 17th century large areas of South India came under the direct rule or influence of the expanding Mughal Empire. While most of Indian society in its thousands of villages remained untouched by the political struggles going on around them, Indian courtly culture evolved into a unique blend of Hindu and Muslim traditions.

The first British outpost in South Asia was established by the English East India Company in 1619 at Surat on the northwestern coast. Later in the century, the Company opened permanent trading stations at Madras (now Chennai), Bombay (now Mumbai), and Calcutta (now Kolkata), each under the protection of native rulers.

The British expanded their influence from these footholds until, by the 1850s, they controlled most of present-day India, Pakistan, Sri Lanka, and Bangladesh. In 1857, an unsuccessful rebellion in north India led by Indian soldiers seeking the restoration of the Mughal Emperor caused the British Parliament to transfer political power from the East India Company to the Crown. Great Britain began administering most of India directly, while controlling the rest through treaties with local rulers.

In the late 1800s, the first steps were taken toward self-government in British India with the appointment of Indian councilors to advise the British Viceroy and the establishment of Provincial Councils with Indian members; the British subsequently widened participation in Legislative Councils. Beginning in 1920, Indian leader Mohandas K. Gandhi transformed the Indian National Congress political party into a mass movement to campaign against British colonial rule. The party used both parliamentary and nonviolent resistance and non-cooperation to agitate for independence. During this period, however, millions of Indians served with honor and distinction in the British armed forces, including service in both World Wars and countless other overseas actions in service of the Empire.

With Indians increasingly united in their quest for independence, a war-weary Britain led by Labor Prime Minister Clement Attlee began in earnest to plan for the end of its suzerainty in India. On August 15, 1947, India became a dominion within the Commonwealth, with Jawaharlal Nehru as Prime Minister. Strategic colonial considerations, as well as political tensions between Hindus and Muslims, led the British to partition British India into two separate states: India, with a Hindu majority; and Pakistan, which consisted of two "wings," East and West Pakistan--currently Bangladesh and Pakistan--with Muslim majorities. India became a republic within the Commonwealth after promulgating its Constitution on January 26, 1950.

After independence, the Indian National Congress, the party of Mohandas K. Gandhi and Jawaharlal Nehru, ruled India under the leadership first of Nehru and then his daughter (Indira Gandhi) and grandson (Rajiv Gandhi), with the exception of brief periods in the 1970s and 1980s, during a short period in 1996, and the period from 1998-2004, when a coalition led by the Bharatiya Janata Party governed.

Prime Minister Nehru governed the nation until his death in 1964. Nehru was succeeded by Lal Bahadur Shastri, who also died in office. In 1966, power passed to Nehru's daughter, Indira Gandhi, Prime Minister from 1966 to 1977. In 1975, beset with deepening political and economic problems, Mrs. Gandhi declared a state of emergency and suspended many civil liberties. Seeking a mandate at the polls for her policies, she called for elections in 1977, only to be defeated by Morarji Desai, who headed the Janata Party, an amalgam of five opposition parties.

In 1979, Desai's Government crumbled. Charan Singh formed an interim government, which was followed by Mrs. Gandhi's return to power in January 1980. On October 31, 1984, Mrs. Gandhi was assassinated, and her son, Rajiv, was chosen by the Congress (I)--for "Indira"--Party to take her place. His Congress government was plagued with allegations of corruption resulting in an early call for national elections in 1989.

Although Rajiv Gandhi's Congress Party won more seats than any other single party in the 1989 elections, he was unable to form a government with a clear majority. The Janata Dal, a union of opposition parties, then joined with the Hindu-nationalist Bharatiya Janata Party (BJP) on the right and the Communists on the left to form the government. This loose coalition collapsed in November 1990, and the Janata Dal, supported by the Congress (I), came to power for a short period, with Chandra Shekhar as Prime Minister. That alliance also collapsed, resulting in national elections in June 1991.

While campaigning in Tamil Nadu on behalf of Congress (I), Rajiv Gandhi was assassinated on May 27, 1991, apparently by Tamil extremists from Sri Lanka, unhappy with India's armed intervention to try to stop the civil war there. In the elections, Congress (I) won 213 parliamentary seats and returned to power at the head of a coalition, under the leadership of P.V. Narasimha Rao. This Congress-led government, which served a full 5-year term, initiated a gradual process of economic liberalization and reform, which opened the Indian economy to global trade and investment. India's domestic politics also took new shape, as the nationalist appeal of the Congress Party gave way to traditional caste, creed, regional, and ethnic alignments, leading to the founding of a plethora of small, regionally based political parties.

The final months of the Rao-led government in the spring of 1996 were marred by several major corruption scandals, which contributed to the worst electoral performance by the Congress Party in its history. The Hindu-nationalist BJP emerged from the May 1996 national elections as the single-largest party in the Lok Sabha but without a parliamentary majority. Under Prime Minister Atal Bihari Vajpayee, the subsequent BJP coalition lasted only 13 days. With all political parties wishing to avoid another round of elections, a 14-party coalition led by the Janata Dal formed a government known as the United Front, under the former Chief Minister of Karnataka, H.D. Deve Gowda. His government collapsed after less than a year, when the Congress Party withdrew its support in March 1997. Inder Kumar Gujral replaced Deve Gowda as the consensus choice for Prime Minister at the head of a 16-party United Front coalition.

In November 1997, the Congress Party again withdrew support from the United Front. In new elections in February 1998, the BJP won the largest number of seats in Parliament--182--but fell far short of a majority. On March 20, 1998, the President approved a BJP-led coalition government with Vajpayee again serving as Prime Minister. On May 11 and 13, 1998, this government conducted a series of underground nuclear tests, spurring U.S. President Clinton to impose economic sanctions on India pursuant to the 1994 Nuclear Proliferation Prevention Act.

In April 1999, the BJP-led coalition government fell apart, leading to fresh elections in September. The National Democratic Alliance--a new coalition led by the BJP--won a majority to form the government with Vajpayee as Prime Minister in October 1999. The NDA government was the first in many years to serve a full five year term, providing much-needed political stability.

The Kargil conflict in 1999 and an attack by terrorists on the Indian Parliament in December 2001 led to increased tensions with Pakistan.

Hindu nationalists supportive of the BJP agitated to build a temple on a disputed site in Ayodhya, destroying a 17th century mosque there in December 1992, and sparking widespread religious riots in which thousands, mostly Muslims, were killed. In February 2002, 57 Hindu volunteers returning from Ayodhya were burnt alive when their train caught fire. Alleging that the fire was caused by Muslim attackers, anti-Muslim rioters throughout the state of Gujarat killed over 900 people and left 100,000 homeless. This led to accusations that the BJP-led Gujarat state government had not done enough to contain the riots, or arrest and prosecute the rioters.

The ruling BJP-led coalition was defeated in a five-stage election held in April and May of 2004, and a Congress-led coalition, known as the United Progressive Alliance (UPA), took power on May 22 with Manmohan Singh as Prime Minister. The UPA's victory was attributed to dissatisfaction among poorer rural voters that the prosperity of the cities had not filtered down to them, and rejection of the BJP's Hindu nationalist agenda.

The Congress-led UPA government has continued many of the BJP's foreign policies, particularly improving relations with the U.S. Prime Minister Singh and President Bush concluded a landmark U.S.-India strategic partnership framework agreement on July 18, 2005. In March 2006, President Bush visited India to further the many initiatives that underlie the new agreement. The strategic partnership is anchored by a historic civil nuclear cooperation initiative and includes cooperation in the fields of space, high-technology commerce, health issues, democracy promotion, agriculture, and trade and investment.

Again in general elections held on April-May,2009 Congress Led UPA again emerged Victorious and is set to form government for another 5 Years to come.