History of India . An overview : 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. As they settled in the middle Ganges River valley, they 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 Indian subcontinent over a period of 500 years. In the 10th and 11th centuries, Turks and Afghans invaded India and established sultanates in Delhi. In the early 16th century, descendants of Genghis Khan swept across the Khyber Pass and established the Mughal (Mogul) Dynasty, which lasted for 200 years. From the 11th to the 15th centuries, southern India was dominated by Hindu Chola and Vijayanagar Dynasties. During this time, the two systems--the prevailing Hindu and Muslim--mingled, leaving lasting cultural influences on each other.

The first British outpost in South Asia was established in 1619 at Surat on the northwestern coast. Later in the century, the East India Company opened permanent trading stations at Madras, Bombay, and Calcutta, each under the protection of native rulers.
On August 15, 1947, India became a dominion within the Commonwealth, with Jawaharlal Nehru as Prime Minister. Enmity between Hindus and Muslims led the British to partition British India, creating East and West Pakistan, where there were Muslim majorities. India became a republic within the Commonwealth after promulgating its constitution on January 26, 1950.

After independence, the Congress Party, the party of Mahatma Gandhi and Jawaharlal Nehru, ruled India under the influence first of Nehru and then his daughter and grandson, with the exception of two brief periods in the 1970s and 1980s.

Prime Minister Nehru governed India until his death in 1964. He 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 Moraji 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 government was brought down in 1989 by allegations of corruption and was followed by V.P. Singh and then Chandra Shekhar.

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