Which statement provides the best evidence that Spain was the dominant colonial power in Latin America?

Argentina elects representatives to the legislature of Spain.
Spanish is the principal language spoken in most of Latin America.
Spain continues to provide military support for Latin America
Spain and Mexico continue to use the same currency.

Spanish is the principal language spoken in most of Latin America.

This statement highlights the lasting impact of Spanish colonization in Latin America, as the Spanish language is widely spoken across the region. Language is a key aspect of cultural domination, and the prevalence of Spanish in Latin America is evidence of Spain's historical influence in the region.