The world cannot be stable when a superpower exists unchallenged. Before the collapse of the Soviet Union, in the early nineties, there was a balance between the two superpowers. Each held the other's aggression in check. Since the U.S. is now the only superpower, the world has become destabilized.
Today there is no world force to challenge the U.S. globalization endeavors.
The United States has become emboldened, running slipshod over the sovereignty of many nations. The U.S. dictates the terms and conditions of commerce with many countries. The most outstanding example of this is the Cuban embargo. Comparatively speaking, none of these existed when there were two superpowers. Immediately after the collapse of the Soviet Union, lining up nations to support ex-President Bush's Gulf War was the first impact of U.S. domination over other nation's sovereignty.