Pioneering work by Karl Deutsch on the dynamics of nationalism, rooted
in its evolution as a modern European phenomenon, helped to pave the
way for an understanding of the post-imperial development of ethnonati
onalist movements in contemporary states of the Second and Third World
s. The eruption of such movements in multi-ethnic societies is a moder
n and growing phenomenon. It reflects both the widespread acceptance o
f self-determination as a democratic ideal and the availability of con
temporary communications technology, organizational skills, and weapon
s of mass violence. The brutal realities of authoritarianism and anarc
hy in many countries contradict the hopes raised by modern dreams of d
emocracy and economic prosperity. In this context, we need to understa
nd that viable systems of constitutional government-where power is exe
rcised responsibly and effectively-offer the only hope that ethnonatio
nal violence can be replaced by the nonviolent politics of ethnic comp
etition. External interventions designed to resolve violent communal c
onflicts are less likely to succeed than are systemic transformations
that replace authoritarianism with constitutional governance-but both
pose a huge challenge to the will and capabilities of the more advance
d industrial democracies.