The United States, at least, can claim a good and moral reason for going to war. We tried hard to stay neutral, than went to war with Germany when they persisted in sinking our ships. This is only true from the American perspective, LT -- although it is a valid perspective. Remember that Germany's strategic position demanded an offeensive posture by virtue of geography. So it was true in thier moves against France in 1914, so it was true in how they related to America. It was true America was neutral in the conflict, moreso than they would be in WWII before they entered. And it was a more justified position to take at the time. What occurred was not so much that the Germans persisted in sinking American ships -- but they persisted in sinking ANY ships bound with goods and cargo for France and Britain (Russia too, technically, but they didn't really have to worry about that lost cause). America would have traded equally with Germany and Britian, but America was not about to run the British blockade of Germany to do it. That blockade -- the British sanction regime -- was winning the entire war (and did win it... never let anyone tell you sanctions DON'T work: they won WWI). The Germans could not afford the passive position of letting America treat both sides equally becuase the British had a much more equal geographic position than the Germans. They had a huge coastline open to America to trade, as did France: Germany did not. Therefore -- unless the Americans were going to stand up and demand that the British allow them unfettered access to German harbors... something even the Germans knew would never happen since it was not incumbent upon them or anyone to do so... they had to equal the playing field and cause issues for Britian's supply lines. Unrestricted submarine warfare was the only realistic way to do that. As it turned out, that proved ineffective as well. The British decided on a convoy system and as it turned out, a convoy of ships was no easier for the U-Boat packs to find than a lone stray shup on its own. And they were better defended in a convoy now. But that's beside the point. It was if anything an inevitability of geography: the nature of who Germany's foes were in position with America dictated that America and Germany would inevitably come into conflict even if they wished to avoid it. In order to win thier war, they could not afford to not sink neutral ships that traded with thier enemies. With thier ships sunk, America could not afford not to enter the war and treat the sinkings as an affront.