On the larger islands there may be several different language groups requiring the trader to deal in several languages. On the smaller islands there may be only <span>one language so it is easier to trade with the occupants. (Im sorry if this does not help)
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There are a number of differences between World War I and II.
The primary is the origin story.
With World War I, the war broke out because of a complex web of diplomatic and military alliances that were summoned after the assassination of the Arch Duke of the Austro Hungarian Empire. It was further exacerbated by a culture of nationalism throughout Europe.
World War II broke out because of the belligerence of the German Third Reich and its allies.