"For all the pain it caused, the Suez crisis had marked America's ascension into world leadership. With a sigh of relief, American used the occasion of Suez to cut itself loose from allies it had always held accountable for the blight of Realpolitik and for their flawed devotion to the balance of power. But, life being what it is, America would not be permitted to remain pristine. Suez turned out to be America's initiation into the realities of global power, one of the lessons of which is that vacuums always get filled and the that the principal issue is not whether, but by whom.
(p. 548) (...)
America's attempt to dissociate from Europe had landed it in the position of having to assume by itself the burden of protecting every free (that is, noncommunist) nation in every region of the globe. Though during the Suez crisis America was still attempting to deal with the ambiguities of equilibrium in the developing world via the United Nations, within two years American forces would be landing in Lebanon in pursuit of the Eisenhower doctrine. A decade later, America would be grappling with it all alone in Vietnam, most of its allies having dissociated from it by invoking many an argument from the days of Suez as scripted by America itself
(p 549)"
Henry Kissinger in "Diplomacy", 1994, Simon & Schuster, NYC NY US.