With popular uprisings turfing out rulers in Tunisia, Egypt and perhaps elsewhere in the Arab world, a lot of analysts have focused on fears of ''contagion' ' in other regions, notably on China's censorship of news reports about the protest wave in the Middle East. Yet the Middle East event that might have the most far-reaching effect is not the awakening of the Arab ''street'' against authoritarian rulers, but the vote in a United Nations supervised referendum a month earlier. The largely African people in the south of Sudan voted overwhelming to secede from their Arab-dominated country and form a new nation - a result accepted by the Khartoum government and its main foreign backers, including China. This has followed the declaration of independence from Serbia by Kosovo in 2008 that was accepted by most of the world and approved by the International Court of Justice, and Russia's unilateral recognition of Georgia's South Ossetia and...