Here are six reasons why US economic clout will endure.
They pledge a more coordinated response to the global financial crisis, including stronger regulation.
Ahead of the G-20 summit on the financial crisis, many are eyeing Japan's huge foreign reserves. But Tokyo is reluctant to use them on struggling nations.
The G-20 nations, representing most of the world's economy and population, are convening with the knowledge that they will sink or swim together.