1942: No such comparison
Now: Central American Union
Description: Central American Integration System (Spanish: Sistema de la Integración Centroamericana; SICA) is an intergovernmental organization of Central American states. It has a standing invitation to participate as observers in the sessions and the work of the United Nations General Assembly, and maintaining permanent offices at UN Headquarters. Four countries, Guatemala, El Salvador, Honduras, and Nicaragua, are going through a process of political, cultural, and migratory integration and have formed the CA4 (The Central America Four) union, which has introduced common internal borders. The CA4 is joined by Costa Rica in matters of economic integration and regional friendship.
Established: 1991 and on-going unification