The empire built by the Maurya dynasty under Emperor Ashoka united most of modern South Asia except the Tamil kingdoms in the south. From 180 BCE, a series of invasions from Central Asia followed including the Indo-Greeks, Indo-Scythians, Indo-Parthians and Kushans in the northwestern Indian Subcontinent. From the third century CE, the Gupta dynasty oversaw the period referred to as ancient India's "Golden Age." While the north had larger, fewer kingdoms, in the south there were several dynasties such as the Chalukyas, Cholas, Pallavas and Pandyas, overlapping in time and space. Science, engineering, art, literature, astronomy, and philosophy flourished under the patronage of these kings.

Following the invasions from Central Asia, between the tenth to the twelfth centuries, much of north India came under the rule of the Delhi Sultanate, and later the Mughal dynasty, who gradually expanded their reign through large parts of the Indian subcontinent. Nevertheless, several indigenous kingdoms flourished, especially in the south, like the Vijayanagara Empire. From the sixteenth century onwards, several European countries, including Portugal, Netherlands, France and the United Kingdom, started arriving as traders, later taking advantage of the fractious nature of relations between the kingdoms, to establish colonies in the country. By 1856, most of India came under control of the British East India Company. A year later, a nationwide insurrection of rebelling military units and kingdoms, known locally as the First War of Indian Independence (known as the Sepoy Mutiny elsewhere) broke out, which failed even as it seriously challenged British rule. As a consequence, India came under the direct control of the British Crown as a colony of the British Empire.

In the early twentieth century, a nationwide struggle for independence was launched by the Indian National Congress, largely led by Mahatma Gandhi. Millions of protestors would engage in mass campaigns of civil disobedience with a commitment to ahimsa or non-violence. Finally, on 15 August 1947, India gained independence from British rule, but not before losing its Muslim-majority areas which were carved out into a separate nation-state of Pakistan. Three years later, on 26 January 1950, India chose to be a republic, and a new Constitution came into effect.

Since independence, India has seen 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 escalated into the brief Sino-Indian War in 1962; and with Pakistan, which resulted in wars in 1947, 1965, 1971 and in 1999 in Kargil. 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. Significant economic reforms beginning in 1991 have transformed India into one of the fastest-growing economies and an emerging superpower in the world, and added to its global and regional clout.

Stone Age 70,000–3300 BC
· Mehrgarh Culture · 7000–3300 BC
Indus Valley Civilization 3300–1700 BC
Late Harappan Culture 1700–1300 BC
Vedic Period 1500–500 BC
· Iron Age Kingdoms · 1200–700 BC
Maha Janapadas 700–300 BC
Magadha 684–26 BC
· Maurya Dynasty · 321–184 BC
Middle Kingdoms 230 BC–1279 AD
· Satavahana Empire · 230 BC–199 AD
· Kushan Empire · 60–240 AD
· Gupta Empire · 240–550
· Pala Empire · 750–1174
· Chola Empire · 848–1279
Islamic Sultanates 1206–1596
· Delhi Sultanate · 1206–1526
· Deccan Sultanates · 1490–1596
Hoysala Empire 1040–1346
Kakatiya Empire 1083–1323
Vijayanagara Empire 1336–1565
Mughal Era 1526–1707
Maratha Empire 1674–1818
Colonial Era 1757–1947
Modern States 1947 onwards