Because it makes it where the states can not regulate or interfere with federal issues
I think its c) empirical data presented to support conclusions or <span>a) a theory of causation that explains why events happen
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Answer:
The state would need to make sure that at least half of its freed slaves voted in elections.
Explanation:
When he went to Milan, the Duke Sforza appointed him to be a military engineer where he had to design weapons and technological advancements that would help the duke gain warfare supremacy against enemies. He also built buildings and defenses, not just offensive weapons.