Establish that former slaves were to be treated legally as United States Citizens
C- the answer is C. With more power, people don't think clearly and think that with power, they can achieve everything they need
The executive branch carries out laws
A. Harry Hopkins
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I would go with Bubonic Plague.
Reasoning: While all of those answers had some result on economies, the bubonic plague (AKA Black Death) had the greatest economic effect. The more than 20 million that died across Asia and Europe produced a lack of workers that slashed economic growth while the laborers who still remained demanded higher wages due to the increase of work, causing continental economic havoc.