"<span>The United States had a democratic system, and the Soviet Union
had a single-party system" would be the best option since the USSR was
communist.
</span>
Answer:
<u>Constantine</u> was also the first emperor to adhere to Christianity. He issued an edict that protected Christians in the empire and converted to Christianity on his deathbed in 337.
Explanation:
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D.
All of these were problems the Roman Empire was facing in the late second and third centuries.
