How does Crioulo help unite speakers of different languages in Guinea-Bissau?

In Guinea-Bissau, the population is composed of more than 20 distinct ethnic groups, each with its own language or dialect from the Atlantic and Mande branches of the Niger-Congo languages.1

While Portuguese serves as the official language of the country, it is Crioulo that functions as the lingua franca. By serving as a common medium of communication, Crioulo bridges the linguistic divide between these diverse groups, exerting a significant unifying influence, particularly in rural areas where it is widely spoken. This creole language, which emerged during the slave trade, effectively facilitates interaction across the country's varied ethnic landscape.21