External aggression is an analytic category used by Latin American States regardless the governmental ideology or their political affiliations. A comparative study conducted out between two Latin American Small States enables to understand the regularities in their behavior when facing such kind of threat, in terms of their role identity, objective and subjective interests and consistently their foreign policy actions at the domestic, bilateral, sub-regional and regional level. This article argued that the small states are more vulnerable to the external aggressions because of their lack of material resources and their need of external support, compromising their sovereignty and territorial integrity, and requiring the activation of multilateral mechanisms such as the Organization of American States and other regional and sub-regional institutions.
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