<span>The Mayan economy was similar to the economy of ancient river civilizations because t</span>he Maya traded locally available materials for materials from other regions.
Answer: I think it is D
Explanation: It says, "In the Dred Scott decision of 1857, the Court had ruled that African Americans were not citizens"
For any value of x, y=10.
So, the algebraic rule is
.
The value will never change.
<span>For the answer to the question above, the main actions between the main adversaries, for which the world should be grateful for, was that an all out nuclear war did not happen.
I hope my answer helped you. Feel free to ask more questions. Have a nice day!</span>