The Constitution of India (IAST: ) is the supreme law of India. The document lays down the framework that demarcates fundamental political code, structure, procedures, powers, and duties of government institutions and sets out fundamental rights, directive principles, and the duties of citizens. It is the longest written national constitution in the world. It imparts constitutional supremacy (not parliamentary supremacy, since it was created by a constituent assembly rather than Parliament) and was adopted by its people with a declaration in its preamble. Parliament cannot override the constitution. It was adopted by the Constituent Assembly of India on 26 November 1949 and became effective on 26 January 1950. The constitution replaced the Government of India Act 1935 as the country's fundamental governing document, and the Dominion of India became the Republic of India. To ensure constitutional autochthony, its framers repealed prior acts of the British parliament in Article 395. India celebrates its constitution on 26 January as Republic Day. The constitution declares India a sovereign, socialist, secular, and democratic republic, assures its citizens justice, equality, and liberty, and endeavours to promote fraternity. The original 1950 constitution is preserved in a nitrogen-filled case at the Parliament House in New Delhi. The words "secular" and "socialist" were added to the preamble by 42nd amendment act in 1976 during the Emergency. Background In 1928, the All Parties Conference convened a committee in Lucknow to prepare the Constitution of India, which was known as the Nehru Report. Most of the colonial India was under British rule from 1857 to 1947. From 1947 to 1950, the same legislation continued to be implemented as India was a dominion of Britain for these three years, as each princely state was convinced by Sardar Patel and V.P.Menon to sign the articles of integration with India, and the British government continued to be responsible for the external security of the country. Thus, the constitution of India repealed the Indian Independence Act 1947 and Government of India Act 1935 when it became effective on 26 January 1950. India ceased to be a dominion of the British Crown and became a sovereign, democratic and republic with the constitution. Articles 5, 6, 7, 8, 9, 60, 324, 366, 367, 379, 380, 388, 391, 392, 393, and 394 of the constitution came into force on 26 November 1949, and the remaining articles became effective on 26 January 1950 which is celebrated every year