President George W. Bush has demonstrated impressive flexibility in reshaping his approach to foreign policy to deal with the new international challenges brought to the fore by the terrorist attacks.

Before Sept. 11, President Bush embraced a humble mission for the United States in the world. This country, he believed, had to "preserve the peace" by seeking to maintain the basic balance of power between nations. Now, Bush has abandoned the preservation of the old system. Instead, he seeks to change it by promoting liberty, freedom and eventual democracy in countries ruled by autocrats.