Final answer:
Countries depend on each other because of economic ties, which can strengthen their relations.
Step-by-step explanation:
Countries depend on one another because of economic ties. This interdependence can strengthen the relations between countries.
Countries establish economic relationships with each other through trade and investment. For example, one country may export goods and services to another country while importing resources or products that it lacks. This mutual dependence on each other's economic resources and markets can strengthen their relations.