David Fuller's view On the eve of the American Civil War, Abraham Lincoln famously said that "a house divided cannot stand." Today, the European Union -- committed for decades to the quest for "ever closer union" -- must confront an agonizing truth. Lincoln's maxim must be inverted. For the EU to survive, the euro must divide.

Between the Treaty of Rome in 1957 and the Single European Act in 1986, Europe's governments brought about the one great peaceful revolution the continent has seen in its long and troubled history. The creation of a single European currency would build on this remarkable success. It was the next vital step to greater unity and prosperity. The economic crisis in southern Europe shows that the euro system, at least in its current form, has instead become a mortal threat to both.

Greece, Spain, Portugal, Italy and Cyprus are trapped in a recession and cannot restore their competitiveness by devaluing their currencies. The euro area's northern economies have had to join in repeated bailouts and put aside their notions of prudent finance. A vicious circle of resentment and populism in the south and strengthening nationalism in the north is tearing the union apart.

And the crisis isn't yet abating. France, Europe's second-largest economy, is now sinking into a grave economic slump. Like the southern countries, it must restore its competitiveness; like them, as part of the euro system, it lacks the means. Because of its size and because of the guiding role it has played in the EU's development, France, we'll argue in Part 2 of this article, will be crucial in breaking the vicious circle.