If China aspires to rise among the global powers and meet the international expectations it’s long courted, it has to pluck up the political courage to re-envision itself. It’s got a lot to work with. The East Asian giant boasts a stable, low unemployment rate. Its many large cities feature extensive public transportation networks and lack the slums so common in many other developing nations. And with a prematurely aging population, it’s facing a looming demographic crisis; immigration could help prevent long-term economic stagnation associated with a shortage of young workers and a growing number of retired dependents.