Making of the Constitution & historical underpinnings
How the Indian Constitution was framed: the Constituent Assembly, colonial statutory ancestry, and the borrowed-features and Objectives Resolution lineage UPSC tests heavily.
From Company Rule to a Constituent Power
The Indian Constitution did not emerge from a vacuum in 1950; roughly two-thirds of its text is traceable to British statutory architecture built between 1858 and 1935. The Regulating Act of 1773 created the office of Governor-General of Bengal (Warren Hastings) and a Supreme Court at Calcutta (1774), planting the first seeds of central authority. Pitt's India Act, 1784 introduced dual control via the Board of Control. The Charter Act of 1833 made the Governor-General of Bengal the Governor-General of India (Lord William Bentinck) and centralised legislative power.
The Crown, Councils and Provincial Autonomy
The Government of India Act, 1858 ended Company rule after the Revolt of 1857, transferring governance to the Crown and creating the Secretary of State for India aided by a 15-member Council. The Indian Councils Act, 1861 restored legislative devolution to provinces and introduced Indians into law-making (Lord Canning nominated three in 1862). The Indian Councils Act, 1892 enlarged councils and introduced an indirect, limited election principle. The Morley-Minto Reforms (Indian Councils Act, 1909) introduced communal/separate electorates for Muslims, a fateful step toward partition.
The Montagu-Chelmsford Reforms / Government of India Act, 1919 introduced dyarchy in the provinces (transferred and reserved subjects), bicameralism at the centre and direct elections, and separated central and provincial budgets. The Government of India Act, 1935—the single largest source of the present Constitution—provided for an All-India Federation (never realised), provincial autonomy (operational 1937), a federal court (established 1937), and a three-fold distribution of powers via Federal, Provincial and Concurrent Lists. The Indian Independence Act, 1947 partitioned British India and made the Constituent Assembly a fully sovereign body.
The Demand for a Constituent Assembly
The idea of Indians framing their own constitution was voiced as early as 1922 by Mahatma Gandhi and formalised in M.N. Roy's 1934 demand. The Nehru Report of 1928, drafted by Motilal Nehru, was the first major Indian attempt at a constitutional blueprint and proposed dominion status, fundamental rights and a unitary-leaning federation. The Congress formally demanded a Constituent Assembly elected on adult franchise in 1935 and 1936. The British conceded the principle in the August Offer of 1940 and explicitly in the Cripps Mission of 1942.
The Constituent Assembly was finally constituted under the Cabinet Mission Plan of 1946, which rejected a wholly elected body chosen by adult franchise in favour of indirect election by provincial legislative assemblies through a system of proportional representation by single transferable vote, with seats allotted among the three communities—General, Muslim and Sikh—in proportion to population. This statutory ancestry is the high-yield foundation: UPSC repeatedly asks which Act introduced which feature.