What was an effect of vertical integration?

Which sentence is the best explanation of how food surpluses led to a job specialization during the neolithic revolution

Aresult of japan’s attack on pearl harbor was? a the us formed a pact with indochina against japan. b the us formed a pact with germany against japan. c thousands of americans died, and the us declared war. d thousands of japanese people died, and japan declared war.

During world war 2 mexican workers came to the united states as part of the