Answer:
E. All of these
Explanation:
I'm Pretty sure it's all.
The Voting Rights Act of <span>1965</span>
The differences in how the war affected each nation, with the US having less destruction and casualties compared to the Soviet Union is your best answer.
Another reason is the fact that they used two seperate types of government, and each tries to impose it's own kind on other countries in an effort to be able to be the "leader of the world".
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<span>Abd Ar-Rahman was a Muslim conqueror and leader that created a Muslim empire in the Iberian penensula, today known as Spain and Portugal. This dynasty lasted for a long time before Christianity and the Spaniards took over.</span>