Answer:
<h3>The Zhou created the Mandate of Heaven: the idea that there could be only one legitimate ruler of China at a time, and that this ruler had the blessing of the gods. They used this Mandate to justify their overthrow of the Shang, and their subsequent rule.</h3>
Answer:
O <em>Conditions in the south after reconstruction led many African Americans to migrate</em>.
Explanation:
Fits best with the story.