The answer to this would be the Commerce Clause. Hope this helps! :)
The Great Depression Cuz The Russian And French Never Spoke About That Always Rember The French And Russian Are The Same Thing But Different Countries And Different Leaders Because Both Leaders Made A Mistake Which Lead To Their Death But I Bet You Already Know That But Anyways The Answer Is Great Depression
I would say A primary source...
The 14th amendment did much to educate and provide jobs for newly freed slaves following the end of the civil war.