The disparate prospects of each continent have little in common. To the extent that they can be linked by a single theme in 2013, however, it is the idea of the unraveling of the global economy and the political integration that supported it. After two decades of globalization, this year will see each of the big political theaters re-erecting barriers and focusing more on domestic repairs than on global expansion. The unraveling has its roots in longer-term trends, but it is set to step up in the next year.