Identification with a perceived external enemy has been a central aspect of many disadvantage-based solidarity campaigns, for example, the anti-racism movement's identification with continuing racist practices in American society or American Jewish support for Israel in a hostile Middle East environment. So when peace is declared in the Middle East new internal divisions emerge within the Israeli and American Jewish communities no longer united against a set of common enemies, or as racism is diminished in American society, the black civil rights movement discovers an erosion in the collective sense of solidarity which once made it powerful and focused.
In the opinion of some commentators, the fall of the USSR brought on a national crisis of identity in the USA. The image of the USSR as a monolithic evil served to reinforce the identity of the USA as a monolithic virtue. With the loss of a convincing foreign demon, the country turns inward to search for equivalent evils within.