Discovery of streets arranged in grid-like patterns and a system of pipes for moving water in Harappa and Mohenjo Daro suggest that ancient river valley cities in South Asia has what?

Me! will mark brainiest! essential questions: • for what reasons will one group of people exploit another? focus questions: • what influenced the development of the south more: geography, economy or slavery? • what were the economic, political and social arguments for and against slavery in the first half of the 19th century?