Stone Age rock shelters with paintings at the Bhimbetka rock shelters in Madhya Pradesh are the earliest known traces of human life in India. The first known permanent settlements appeared over 9,000 years ago and gradually developed into the Indus Valley Civilization, dating back to 3300 BCE in western India. It was followed by the Vedic period, which laid the foundations of Hinduism and other cultural aspects of early Indian society, and ended in the 500s BC. From around 550 BCE, many independent kingdoms and republics known as the Mahajanapadas were established across the country.

Nevertheless, several indigenous kingdoms, such as the Vijayanagara Empire, flourished, especially in the south. In the seventeenth and eighteenth century, the Mughal supremacy declined and the Maratha Empire became the dominant power. From the sixteenth century, several European countries, including Portugal, the Netherlands, France, and the United Kingdom, started arriving as traders and later took advantage of the fractious nature of relations between the kingdoms to establish colonies in the country. By 1856, most of India was under the control of the British East India Company. A year later, a nationwide insurrection of rebelling military units and kingdoms, variously referred to as the First War of Indian Independence or Sepoy Mutiny, seriously challenged British rule but eventually failed. As a consequence, India came under the direct control of the British Crown as a colony of the British Empire.

Since independence, India has experienced sectarian violence and insurgencies in various parts of the country, but has maintained its unity and democracy. It has unresolved territorial disputes with China, which in 1962 escalated into the brief Sino-Indian War; and with Pakistan, which resulted in wars in 1947, 1965, 1971, and 1999. India is a founding member of the Non-Aligned Movement and the United Nations (as part of British India). In 1974, India conducted an underground nuclear test. This was followed by five more tests in 1998, making India a nuclear state. Beginning in 1991, significant economic reforms have transformed India into one of the fastest-growing economies in the world, adding to its global and regional clout.

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The legislature of India is the bicameral Parliament, which consists of the upper house called the Rajya Sabha (Council of States) and the lower house called the Lok Sabha (House of People). The Rajya Sabha, a permanent body, has 245 members serving staggered six year terms. Most are elected indirectly by the state and territorial legislatures in proportion to the state's population. The 543 of the Lok Sabha's 545 members are directly elected by popular vote to represent individual constituencies for five year terms. The other two members are nominated by the President from the Anglo-Indian community if, in his opinion, the community is not adequately represented.

The executive branch consists of the President, Vice-President, and the Council of Ministers (the Cabinet being its executive committee) headed by the Prime Minister. Any minister holding a portfolio must be a member of either house of parliament. In the Indian parliamentary system, the executive is subordinate to the legislature, with the Prime Minister and his Council being directly responsible to the lower house of the parliament.

India has a unitary three-tier judiciary, consisting of the Supreme Court, headed by the Chief Justice of India, twenty-one High Courts, and a large number of trial courts. The Supreme Court has original jurisdiction over cases involving fundamental rights and over disputes between states and the Centre, and appellate jurisdiction over the High Courts. It is judicially independent, and has the power to declare the law and to strike down union or state laws which contravene the Constitution. The role as the ultimate interpreter of the Constitution is one of the most important functions of the Supreme Court.

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The INC was out of power between 1977 and 1980, when the Janata Party won the election owing to public discontent with the "Emergency" declared by the then Prime Minister Indira Gandhi. In 1989, a Janata Dal-led National Front coalition in alliance with the Left Front coalition won the elections but managed to stay in power for only two years.

The years 19961998 were a period of turmoil in the federal government with several short-lived alliances holding sway. The BJP formed a government briefly in 1996, followed by the United Front coalition. In 1998, the BJP formed the National Democratic Alliance (NDA) with several regional parties and became the first non-Congress government to complete a full five-year term. In the 2004 Indian elections, the INC won the largest number of Lok Sabha seats and formed a government with a coalition called the United Progressive Alliance (UPA), supported by various left-leaning parties and members opposed to the BJP.

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In recent years, India has played an influential role in the ASEAN, SAARC, and the WTO. India is a founding member and long time supporter of the United Nations, with over 55,000 Indian military and police personnel having served in thirty-five UN peace keeping operations deployed across four continents. Despite criticism and military sanctions, India has consistently refused to sign the CTBT and the NPT, preferring instead to maintain sovereignty over its nuclear program. Recent overtures by the Indian government have strengthened relations with the United States, China, and Pakistan. In the economic sphere, India has close relationships with other developing nations in South America, Asia, and Africa.

India maintains the third largest military force in the world by number of active troops, which consists of the Indian Army, Navy, and Air Force. Auxiliary forces such as the Paramilitary Forces, the Coast Guard, and the Strategic Forces Command also come under the military's purview. The President of India is the supreme commander of the Indian armed forces. India became a nuclear power in 1974 after conducting an initial nuclear test, Operation Smiling Buddha. Further underground testing in 1998 led to international military sanctions against India, which were gradually withdrawn after September 2001. India maintains a "no first use" nuclear policy and has a "strong nuclear non-proliferation record" according to the White House, despite not being a signatory to the Nuclear Non-Proliferation Treaty.

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India is a federal republic of twenty-eight states and seven Union Territories. All states, the union territory of Puducherry, and the National Capital Territory of Delhi have elected governments. The other five union territories have centrally appointed administrators and hence are under direct rule of the President. In 1956, under the States Reorganisation Act, states were formed on a linguistic basis. Since then, this structure has remained largely unchanged. Each state or union territory is divided into basic units of government and administration called districts. There are nearly 600 districts in India. The districts in turn are further divided into tehsils and eventually into villages.

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In the former seabed immediately south of the emerging Himalayas, plate movement created a vast through, which, having gradually been filled with river-borne sediment, now forms the Indo-Gangetic Plain. To the west of this plain, and cut off from it by the Aravalli Range, lies the Thar Desert. The original Indian plate now survives as peninsular India, the oldest and geologically most stable part of India, and extending as far north as the Satpura and Vindhya ranges in central India. These parallel ranges run from the Arabian Sea coast in Gujarat in the west to the coal-rich Chota Nagpur Plateau in Jharkhand in the east. To their south, the remaining peninsular landmass, the Deccan Plateau, is flanked on the left and right by the coastal ranges, Western Ghats and Eastern Ghats respectively; the plateau contains the oldest rock formations in India, some over one billion years old. Constituted in such fashion, India lies to the north of the equator between 644' and 3530' north latitude and 687' and 9725' east longitude.

India's coast is 7,517 kilometers (4,671 mi) long; of this distance, 5,423 kilometers (3,370 mi) belong to peninsular India, and 2,094 kilometers (1,301 mi) to the Andaman, Nicobar, and Lakshadweep Islands. According to the Indian naval hydrographic charts, the mainland coast consists of the following: 43% sandy beaches, 11% rocky coast including cliffs, and 46% mudflats or marshy coast.

Major Himalayan-origin rivers that substantially flow through India include the Ganges and the Brahmaputra, both of which drain into the Bay of Bengal. Important tributaries of the Ganges include the Yamuna and the Kosi, whose extremely low gradient causes disastrous floods every year. Major peninsular rivers whose steeper gradients prevent their waters from flooding include the Godavari, the Mahanadi, the Kaveri, and the Krishna, which also drain into the Bay of Bengal; and the Narmada and the Tapi, which drain into the Arabian Sea. Among notable coastal features of India are the marshy Rann of Kutch in western India, and the alluvial Sundarbans delta, which India shares with Bangladesh. India has two archipelagos: the Lakshadweep, coral atolls off India's south-western coast; and the Andaman and Nicobar Islands, a volcanic chain in the Andaman Sea.

India's climate is strongly influenced by the Himalayas and the Thar Desert, both of which drive the monsoons. The Himalayas prevent cold Central Asian katabatic winds from blowing in, keeping the bulk of the Indian subcontinent warmer than most locations at similar latitudes. The Thar Desert plays a crucial role in attracting the moisture-laden southwest summer monsoon winds that, between June and October, provide the majority of India's rainfall. Four major climatic groupings predominate in India: tropical wet, tropical dry, subtropical humid, and montane

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Many Indian species are descendants of taxa originating in Gondwana, to which India originally belonged. Peninsular India's subsequent movement towards, and collision with, the Laurasian landmass set off a mass exchange of species. However, volcanism and climatic changes 20 million years ago caused the extinction of many endemic Indian forms. Soon thereafter, mammals entered India from Asia through two zoogeographical passes on either side of the emerging Himalaya. Consequently, among Indian species, only 12.6% of mammals and 4.5% of birds are endemic, contrasting with 45.8% of reptiles and 55.8% of amphibians. Notable endemics are the Nilgiri leaf monkey and the brown and carmine Beddome's toad of the Western Ghats. India contains 172, or 2.9%, of IUCN-designated threatened species. These include the Asiatic Lion, the Bengal Tiger, and the Indian white-rumped vulture, which suffered a near-extinction from ingesting the carrion of diclofenac-treated cattle.

In recent decades, human encroachment has posed a threat to India's wildlife; in response, the system of national parks and protected areas, first established in 1935, was substantially expanded. In 1972, India enacted the Wildlife Protection Act and Project Tiger to safeguard crucial habitat; in addition, the Forest Conservation Act was enacted in 1980. Along with more than five hundred wildlife sanctuaries, India hosts thirteen biosphere reserves, four of which are part of the World Network of Biosphere Reserves; twenty-five wetlands are registered under the Ramsar Convention.

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Major agricultural crops include rice, wheat, oilseed, cotton, jute, tea, sugarcane, and potatoes. The agricultural sector accounts for 28% of GDP; the service and industrial sectors make up 54% and 18% respectively. Major industries include automobiles, cement, chemicals, consumer electronics, food processing, machinery, mining, petroleum, pharmaceuticals, steel, transportation equipment, and textiles.

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The number of dialects in India is as high as 1,652.Over 800 million Indians (80.5%) are Hindu. Other religious groups include Muslims (13.4%), Christians (2.3%), Sikhs (1.9%), Buddhists (0.8%), Jains (0.4%), Jews, Zoroastrians, Bah's and others. Tribals constitute 8.1% of the population.

India's literacy rate is 64.8% (53.7% for females and 75.3% for males). The state of Kerala has the highest literacy rate (91%); Bihar has the lowest (47%). The national human sex ratio is 944 females per 1,000 males. India's median age is 24.9, and the population growth rate of 1.38% per annum; there are 22.01 births per 1,000 people per year.

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Spices originally native to the Indian subcontinent that are now consumed world wide include black pepper; in contrast, hot chili peppers, popular across India, were introduced by the Portuguese.

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