Nigeria’s linguistic diversity presents both opportunities and challenges for nation-building, particularly in the context of colonial and pre-colonial historical interactions. Despite the widespread use of indigenous and contact languages such as Hausa and Nigerian Pidgin, there remains a lack of coherent policy and scholarly consensus on their role in fostering national integration. The problem this paper addresses is the limited recognition of these languages as historical products of Trans-Saharan and Trans-Atlantic exchanges and their underutilisation in nation-building discourse. The objective of the paper is to examine Hausa and Nigerian Pidgin as linguistic outcomes of historical trade networks and to assess their potential contributions to social cohesion and national integration in Nigeria. The paper adopts a qualitative research design, relying on secondary sources including academic literature, historical texts, policy documents, and credible media reports, analysed through content analysis. The theoretical framework is grounded in historical linguistics and social constructivism, which explain how languages evolve through contact and how they function as socially constructed tools of identity and integration. Findings reveal that Hausa, influenced by Trans-Saharan trade and Nigerian Pidgin, shaped by TransAtlantic interactions, have evolved into widely used lingua francas that transcend ethnic boundaries. Their continued expansion demonstrates their capacity to facilitate communication across diverse groups. The paper concludes that these languages can play a significant role in nation-building if properly recognised and integrated into language policy. It recommends inclusive language planning, multilingual education policies, and greater institutional support for indigenous and contact languages. The paper contributes to knowledge by linking linguistic evolution to historical trade systems and positioning Hausa and Nigerian Pidgin as strategic assets for national cohesion.