Along with the rise of China, the economic crash and evidence of the limits of US power in the "war on terror", the emergence of an independent Latin America is helping reshape the global order, writes Seumas Milne. Its significance is often underestimated, he warns, however, "if the political and social movements that have driven the continent's transformation can maintain their momentum and support, they won't only be laying the foundation of an independent Latin America, but new forms of socialist politics declared an impossibility in the modern era. Two decades after we were told there was no alternative, another world is being created."