An event or series of events?​

What kind os source would a historian use to get a firsthand account of a past event

Government powers not provided to the national government in the us constitution but are rather given to the states by the 10th amendment is called?

How did government policies contribute to the beginning of the industrial revolution in great britain? o a. the british government passed laws that prevented any businesses outside the country from learning about manufacturing innovations. b. the british government established factories that produced industrial goods at low prices. c. the british government broke up joint stock companies to promote competition. d. the british government paid a large percentage of the wages earned by industrial workers.