The Indian polity has undergone significant changes since the country's independence in 1947. Here are some key milestones that have marked the evolution of Indian polity over the years:

• Adoption of the Indian Constitution in 1950 that established India as a sovereign, socialist, secular, democratic, and republican country.
• The First General Elections in 1952 that marked the beginning of a democratic era in India.
• Introduction of the Panchayati Raj System in the 1950s to decentralize power to the grassroots level.
• Reorganization of States based on linguistic lines in 1956 to ensure better governance and administration.
• Abolition of the Zamindari System in the 1950s to remove the feudal system that existed in the country.
• Emergency Rule imposed by Indira Gandhi in 1975 that suspended civil liberties and provided more power to the government.
• Introduction of the Mandal Commission Report in 1990 to ensure social justice and affirmative action for the backward castes and minorities.
• Implementation of the 73rd and 74th Amendments to the Indian Constitution in 1992 that gave constitutional status to the Panchayati Raj and Urban Local Bodies.
• Formation of a coalition government at the center in 1996 that marked the beginning of a new era of coalition politics in India.
• Introduction of the Right to Information (RTI) Act in 2005 that gave citizens the right to access information held by public authorities.
• Implementation of Goods and Services Tax (GST) in 2017 that marked a significant shift in India's taxation system.

Overall, the Indian polity has evolved over the years to become more democratic, participatory, and inclusive. Despite facing some challenges, the Indian political system has been able to accommodate the diverse aspirations and needs of its large and diverse population.