Answer:
After the Pax Romana, came a period in which the Roman Empire nearly collapsed under the combined pressures of invasion, civil war, plague, and economic depression.
The correct answer to your question is D.
In a few ways the Korean War marked a turning point in the cold War. It was the first time that the newly founded United Nations voted to act militarily in a country. Secondly, it showed that the United States was willing to stop communist expansion by force. thirdly it showed that the future conflict between the free world and communism would be fought not by the US and USSR in a new world war but rather by proxy wars and insurgencies.
They all depended on nature and the land for survival
