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Brainliestttme : describe the following event: increase in islamic extremism in the middle east

All of the following were weaknesses of the articles of confederation, except: a) the central government was not permitted to regulate state, interstate, or foreign trade. b) the central government was not permitted to borrow money. c) the central government had little ability to regulate money. d) the central government had no ability to tax.

Who were the people that migrated south into india and indus valley