What is the most influencial country in World War 1?
The USA joined late in the war(1917), and by that time, the allies were allready winning. Russia had little impact, and rarely, if not never defeated germany; Russia left the war in 1917. This leaves France and the United Kingdom. Throughout the war the United Kingdom was on the offensive, while the Frence were on the defensive. France surviving, most likely would have been critical if they failed; for example, the battle of verdun. So therefore, the most ifluencial country in world war 1 is most likely France.