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¶FOR the third time in a century, a bitter conflict fueled by historic grievances has erupted in Europe, with the United States looking from afar and hoping not to get involved. Of course, this is not being fought on the battlefields but in the arcane arenas of international finance. But as in World War I, which President Woodrow Wilson once dismissed as “a drunken brawl,” and in World War II, which America formally stayed out of until Pearl Harbor, the crisis over the euro will require further American involvement — whether we like it or not.