Uniting States [electronic resource] : voluntary union in world politics / Joseph M. Parent. Parent, Joseph M. Federal government. Confederation of states. Constitutional history United States. European federation. Latin American federation. JC355 .P33 2011 327.116 23 Includes bibliographical references. Description based on print version record. What causes states to politically unify voluntarily? This text develops a realist explanation of voluntary union and argues that unions are the balancing coalitions of last resort. New York ; Oxford : Oxford University Press, c2011. c2011. 2011 Text 1 online resource (xi, 244 p.) : http://dx.doi.org/10.1093/acprof:oso/9780199782192.001.0001 eng United States.