I believe the answer is: Fertile Crescent
Fertile Crescent is a term that used to described a region where human civilizations could thrive due to its capability to sustain many agricultural products. In most cases, this region possess both soil with high amount of nutrients and located not far from a water source.
During the war in Vietnam, the main opponents of the United States were North Vietnam and the Viet Cong, although these forces were being supported by communist states like Russia and China.
Sparta was the largest city-state in Greece in 700 BC