Decolonization is the undoing of colonialism, where a nation establishes and maintains its domination over dependent territories.An early symptom of the weakness of the empire was Britain's withdrawal from India in 1947. During World War Two, the British had mobilised India's resources for their imperial war effort. They crushed the attempt of Mahatma Gandhi and the Indian National Congress to force them to 'quit India' in 1942.Independence Day, observed annually on 15 August, is a National Holiday in India commemorating the nation's independence from the British Empire on 15 August 1947.