Scene of war from 1955 to 1975 (7)

I believe the answer is:

vietnam

(Other definitions for vietnam that I've seen before include "SE Asian country once at war with USA" , "Southeast Asian republic" , "Country at war with itself from the 1950s to 1970s" , "Hanoi's country" , "Met Ivan at the edge of the South China Sea" .)

I've seen this clue in the Sydney Morning Herald.

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