 For northern Indian region, Susan Bayly writes, "until well into the colonial period, much of the subcontinent was still populated by people for whom the formal distinctions of caste were of only limited importance; Even in parts of the so-called Hindu heartland of Gangetic upper India, the institutions and beliefs which are now often described as the elements of traditional caste were only just taking shape as recently as the early eighteenth century—that is the period of collapse of Mughal period and the expansion of western power in the subcontinent.