Answer:
Prohibiting slavery in the territories.
Explanation:
According to the ruling it was decided that Congress had exceeded their authority when ratifying the Missouri Compromise, and therefore "had no power to forbid or abolish slavery in the territories west of Missouri and north of latitude 36°30" (Britannica.com).
Witnesses?
Your question doesn't really have all the information necessary to have an accurate answer.
Answer:
They resulted in higher casualty rates than in the past is the correct answer.
Explanation:
I think its water and iron