The concept of Post-independence India is a historical and political era, beginning on August 15, 1947, when the country achieved freedom from British rule, initially as the Dominion of India. The era was created to solve the immediate problems of nation-building, including the integration of 562 princely states and establishing a stable political and economic system for a diverse population.
The foundational institution of this period is the Constitution of India, an act adopted by the Constituent Assembly on November 26, 1949, and which came into force on January 26, 1950, establishing the Republic of India. The original document contained 395 articles and 8 Schedules. It established a sovereign, democratic republic with a Westminster-style parliamentary system and an independent judiciary.
The early economic mechanism was state-led, connecting to the Planning Commission, which was established on March 15, 1950, to formulate Five-Year Plans for national development. This socialist-inspired model, which prioritized heavy industry and public sector investment, was the dominant economic philosophy until the economic liberalization reforms of 1991.
The most significant recent change is the replacement of the centralized Planning Commission with the NITI Aayog (National Institution for Transforming India) on January 1, 2015, via a Cabinet resolution. This shift replaced the top-down planning model with a think tank approach focused on cooperative federalism and a bottom-up strategy. Other major concepts connected to this period include the States Reorganisation Act, 1956, and the introduction of the Goods and Services Tax (GST) in 2017.