Answer:
A murder ignited the war.
Explanation: Gunmen murdered an English Rancher named John Tunstall which caused the first shooting.
The violent conditions that contributed to the Lincoln County War are the revenge killings.
Revenge killings are the violent conditions that contributed to the Lincoln County War because the killed people belong to both group which also take part in the violence and leads to big war.
So we can conclude that the violent conditions that contributed to the Lincoln County War are the revenge killings.
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