A)a new defensive tactic known as trench warfare
Trench warfare allowed the war to drag on for long periods of time because of the stalemates that ensue from the opposing armies refusing to give up the land under their controls, resulting in high casualties in no man's land.
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Answer:
Declaration of Independence / That thing Nicholas Cage stole that one time.
Explanation:
Based on this map France was the first moderns day country to embrace Christianity among Britain, Russia and Poland. The Prince of France always mantained close relations with the Pope, and France was at one time considered the Church's eldest daughter. Religion has been at the forefront of France many conflicts, namely The Hundred Years Old War against Britain and Protestantism.