Final answer:
A fragile state is a country whose collapse would cause international migration, war, pollution, disease epidemics, or other international security problems.
Step-by-step explanation:
A country whose collapse would cause international migration, war, pollution, disease epidemics, or other international security problems is commonly referred to as a fragile state. Fragile states are characterized by a lack of economic stability, political instability, and social unrest. These countries often face challenges such as corruption, poverty, conflicts, and inadequate governance systems, which make them susceptible to various security problems.