Portuguese is one of the earliest European languages to be disseminated overseas. Although the international spread of Portuguese has been addressed in existing literature, there remains a deficiency in systematic and macro-level analyses. This study focuses on the Portuguese language’s spread from the colonial period to the present, aiming to provide a comprehensive perspective on understanding its historical spread and current status. The research questions mainly include the overseas spread and results of Portuguese during the colonial period, the global status of Portuguese, and the main factors influencing Portuguese spread. In terms of research methodology, a combination of historical analysis, literature review, and qualitative research interviews was employed. At first, by examining historical documents and archival materials, the study reviewed the characteristics of the phases in the dissemination of Portuguese from the Great Discovery to 1974 when Portugal relinquished its overseas colonies. Secondly, based on language spread theory the current state of Portuguese language dissemination was comprehensively examined by using a literature review method. The concepts of inner circle, outer circle, and expanding circle of Portuguese are formed as well. Finally, qualitative research are conducted to analyze the key factors influencing the global promotion of Portuguese. The primary data for this study come from interviews with Portuguese language teachers at various universities in Macau. The data analysis was carried out by using grounded theory and three-level coding with the assistance of NVivo14 software to identify factors influencing the contemporary spread of Portuguese. This study presents the following main conclusions. First, the historical dissemination of the Portuguese language has undergone three significant periods, namely, the opening of new maritime routes, the establishment of the Brazilian colony, and the development of Portuguese Africa. During these phases, factors such as colonial development models, commercial trade, and religious activities have played a positive role in the expansion of Portuguese in various regions. Second, the Portuguese dissemination circles has emerged in terms of the contemporary Portuguese spread. The inner circle comprises Portugal and Brazil, the two countries where Portuguese is the native language; the outer circle includes other Portuguese-speaking countries; and the expansion circle primarily encompasses overseas Portuguese communities and Portuguese language education abroad. This classification aids in a deeper understanding of the distribution and influence of Portuguese on a global scale. Additionally, literature analysis indicates that Portuguese holds a high status and prestige within the global language system. Third, based on the results of grounded theory coding, the core factors influencing contemporary Portuguese dissemination are categorized into four types. Specifically, the value and vitality of language promotion serve as internal factors for the Portuguese spread, which reflects its significance in cultural transmission and social identity. The political and economic driving forces, as external factors, enhance the regional influence of the Portuguese. Besides, language acquisition and Portuguese education are direct factors and primary ways that facilitate the learning and promotion of Portuguese worldwide. Finally, social media and technological advancements represent emerging factors in contemporary Portuguese dissemination, providing new channels for its promotion among younger generations. In summary, this study systematically reviews the dissemination process of Portuguese across different historical stages and explores the current status of Portuguese worldwide as well as various variables affecting its promotion. The findings not only provide theoretical support for understanding the history and influencing factors of Portuguese spread but also offer practical guidance for Portuguese dissemination strategies.
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