What was cultural diffusion in The Olmec and the Mesopotamian civilization?

When conducting research for forming a hypothesis, which practice should historians follow?

Which of these rose during the great depression?

How did the war of 1812 contribute to an increase in u.s. manufacturing? a) the war provided more resources for factories to increase production. b) the war promoted trade between countries so that americans could focus on fighting. c) the war cut americans off from their previous supply of imported manufactured goods. d) the war limited transportation in america, making it necessary to import manufactured goods.