How did the 1980 coup in Guinea-Bissau affect relations with Cape Verde?

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The military coup in Guinea-Bissau on November 14, 1980, led by João "Nino" Vieira against President Luís de Almeida Cabral, had a profound impact on the relationship between Guinea-Bissau and Cape Verde. The event was deeply resented in Cape Verde and effectively severed the military and political unity that had previously existed between the two nations.1

Prior to the coup, both countries were linked through the African Party for the Independence of Guinea and Cape Verde (PAIGC), which had spearheaded the liberation struggle for both territories. Following the coup, the Cape Verdean branch of the PAIGC broke away and reorganized as the African Party for the Independence of Cape Verde (PAICV), explicitly removing any reference to Guinea-Bissau from its name.231