Answer:
Letters and publications written by Nazi leaders before the Second World War.
Explanation:
This answer is correct because this historian is searching for the motives of these perpetrators, letters and publications can tell their thoughts and conversations.
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I think it would be D. "<span>They wanted it to give enslaved people full rights of citizenship."</span>
Supremacy clause states that the Constitution, federal laws, and treaties constitute the supreme law of the land and that every institution should abide by those rules.
