How many countries did usa colonized?

What from the columbian exchange had perhaps the biggest impact on the world?

Which statement best explains the role of government according to thomas hobbes

How did inca develop their road system? a) they used mortar to hold the stones together. b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks. d) they laid roads in the cities, not in the less densely populated deserts.