The ruling in the Dred Scott case was so significant because it addressed

whether African Americans – both enslaved and free – had basic citizenship rights.

whether territories could outlaw slavery.

Explanation:

I got it right on edge

representative government

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.