The answer is Letter C. Iron curtain is the political separation of Western and Eastern Europe. It started from the end of World War II in 1945 until the last part of Cold War in 1991. Countries who are members of the Warsaw pact are located at the east side of the Iron Curtain while NATO members are on the west side.
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The imperial period of Rome lasted approximately 1,500 years compared to the 500 years<span> of the Republican era. The first two centuries of the empire's existence were a period of unprecedented political stability and prosperity known as the Pax Romana, or "Roman Peace"</span>