1) The document traces changes over 1000 years in South Asia by comparing maps from 1154 and 1720, terminology used in different time periods, and social/political/religious transformations.
2) It discusses how historians' sources expanded from just texts to also include coins, inscriptions, architecture, and manuscripts as paper became cheaper. Scribes faced problems copying texts without printing presses that could introduce errors over generations of copies.
3) New technologies, crops, and mobility led to economic, political, social and cultural changes. New social groups like Rajputs, Marathas and Jats became important as peasants and villages formed. Religions also transformed, with Hinduism adopting new deities and temples while