The Harappan Civilization, also known as the Indus Valley Civilization, flourished between 2500 and 1900 BCE and was characterized by advanced urban planning, agriculture, and trade.

The Vedic Period, spanning from 1500 to 500 BCE, witnessed the composition of the Rigveda, the oldest of the four Vedas, which contains hymns and prayers dedicated to various deities.

During the reign of Ashoka in the 3rd century BCE, Buddhism became the official religion of the Maurya Empire, leading to its widespread propagation and influence across the Indian subcontinent.

The Gupta Empire, which flourished between the 4th and 6th centuries CE, witnessed significant progress in mathematics, astronomy, and literature, earning it the reputation as the 'Golden Age' of Indian history.

The Delhi Sultanate, founded by the Mamluk dynasty in the 13th century, held sway over northern India for approximately 300 years, until its eventual decline in the 16th century.

Akbar, the third Mughal emperor, ascended to the throne in 1556 and is widely regarded as the greatest ruler of the Mughal Empire, known for his administrative reforms, religious tolerance, and cultural achievements.

The Maratha Empire, founded by Shivaji in the 17th century, rose to prominence in Western India, particularly in the regions of Maharashtra and Karnataka, and played a significant role in shaping the political landscape of the subcontinent.

The British East India Company, which eventually became the dominant European power in India, established its first trading post in Surat, Gujarat, in 1613, marking the beginning of its commercial and political influence in the subcontinent.

The Indian National Congress, formed in 1885, held its inaugural session in Bombay (now Mumbai), and played a pivotal role in leading the struggle for Indian independence from British rule.

India achieved independence from British colonial rule on August 15, 1947, marking a significant milestone in the country's history and the culmination of decades of struggle and sacrifice.

The Constitution of India, drafted by the Constituent Assembly, came into effect on January 26, 1950, marking the transition of India into a republic and laying the foundation for its democratic governance.

The Green Revolution, a period of agricultural development and increased productivity, was spearheaded by Prime Minister Indira Gandhi in the late 1960s and early 1970s, leading to significant improvements in India's food production.

The economic liberalization policies, aimed at integrating India into the global economy, were initiated by Prime Minister P. V. Narasimha Rao in the early 1990s, leading to significant changes in the country's economic landscape.

The Right to Information Act, a landmark legislation promoting transparency and accountability in governance, was passed in 2005, granting citizens the right to request and receive information from public authorities.

The Goods and Services Tax (GST), a major tax reform aimed at unifying India's indirect tax system, was introduced in 2017, replacing a multitude of state and central taxes.