A handy chart from JPMorgan:
Is America becoming less politically stable? A glance at some foreign newspapers would certainly give that impression. This is an important economic question. The global primacy of Treasury bonds and the dollar stems mostly from the nation’s massive economic might. But confidence in U.S. political stability also plays a role. The shooting of Arizona Congresswoman Gabrielle Giffords, though tragic, shouldn’t alter those perceptions — unless freedom of speech suffers.