linguistic:paraphrasing
British period (c. 1857 – 1947)

During the period of British rule, the colonial administration encroached upon the adivasi tribal system, which led to widespread resentment against the British among the tribesmen. The tribesmen frequently supported rebellions or rebelled themselves, while their raja looked negatively upon the British administrative innovations. Beginning in the 18th century, the British added to the consolidation of feudalism in India, first under the Jagirdari system and then under the zamindari system. Beginning with the Permanent Settlement imposed by the British in Bengal and Bihar, which later became the template for a deepening of feudalism throughout India, the older social and economic system in the country began to alter radically. Land, both forest areas belonging to adivasis and settled farmland belonging to non-adivasi peasants, was rapidly made the legal property of British-designated zamindars (landlords), who in turn moved to extract the maximum economic benefit possible from their newfound property and subjects. Adivasi lands sometimes experienced an influx of non-local settlers, often brought from far away (as in the case of Muslims and Sikhs brought to Kol territory) by the zamindars to better exploit local land, forest and labour. Deprived of the forests and resources they traditionally depended on and sometimes coerced to pay taxes, many adivasis were forced to borrow at usurious rates from moneylenders, often the zamindars themselves. When they were unable to pay, that forced them to become bonded labourers for the zamindars. Often, far from paying off the principal of their debt, they were unable even to offset the compounding interest, and this was made the justification for their children working for the zamindar after the death of the initial borrower. In the case of the Andamanese adivasis, their protective isolation changed with the establishment of a British colonial presence on the islands. Lacking immunity against common infectious diseases of the Eurasian mainland, the large Jarawa habitats on the southeastern regions of South Andaman Island experienced a massive population decline due to disease within four years of the establishment of a colonial presence on the island in 1789.

Land dispossession by the zamindars or interference by the colonial government resulted in a number of Adivasi revolts in the late eighteenth and early nineteenth centuries, such as the Bhumij rebellion of 1767-1833 and Santal hul (or Santhal rebellion) of 1855–56. Although these were suppressed by the governing British authority (the East India Company prior to 1858, and the British government after 1858), partial restoration of privileges to adivasi elites (e.g. to Mankis, the leaders of Munda tribes) and some leniency in levels of taxation resulted in relative calm in the region, despite continuing and widespread dispossession from the late nineteenth century onwards. The economic deprivation, in some cases, triggered internal adivasi migrations within India that would continue for another century, including as labour for the emerging tea plantations in Assam.