The countries' full membership inches the Balkans closer to the borderless idea of Europe and further from the brutal wars of the 1990s.
While the increase in soldiers is modest, the government is showing support for Obama's shift of strategy in Afghanistan – and, more broadly, for the administration itself.
The meeting's great success is $1.1 trillion in economic aid for the developing world, but other proposed solutions to the recession were vague.
As president heads to France, Europeans ask how best to respond to an ally that is suddenly sending all the signals it has hoped for.
At companies, including Caterpillar in France and Visteon in Northern Ireland, workers have occupied offices and detained bosses.
The global crisis has led to political upheaval in many countries, unseating three prime ministers in Europe alone.