Which country is associated with a diverse population including various ethnic groups, predominantly Mestizo?

The country associated with a diverse population that includes various ethnic groups, predominantly Mestizo, is Guatemala. In Guatemala, the Mestizo population—a mix of indigenous and European ancestry—constitutes a significant portion of the country's demographic. Additionally, Guatemala is home to a rich tapestry of indigenous cultures, languages, and traditions that contribute to its ethnic diversity.

In contrast, while Honduras does have a mixed population of Mestizos and indigenous groups, it is less characterized by the prominence of the Mestizo identity compared to Guatemala. Cuba and Jamaica have distinct societal compositions, with Cuba being primarily of Spanish descent and Jamaica being predominantly Afro-Caribbean in heritage. Thus, when considering the prevalence of the Mestizo population, Guatemala stands out as the country that aligns best with the description provided.