Keywords: National languages, languages revitalization, assimilation, linguistic diversity, decolonization

This paper aims to discuss and review how the "National Language Development Act" has been implemented in Taiwanese society since it was promulgated on the 9th of January 2019. The core concept of this act is evaluating the diversity of Taiwanese linguistics and fulfilling the goal of linguistic equality to rectify historical errors resulting from assimilation policies during both the colonial periods of Japan and the Republic of China (The R.O.C.).

To examine and review the influence of the "National Language Development Act," this paper will engage in conducting literature reviews and analyzing relevant case studies as a methodology to develop a comprehensive understanding of the history and development of Taiwanese official or national language policies. It will also provide background information and identify linguistic problems stemming from colonization. Additionally, this paper will analyze and discuss how the "National Language Development Act" plays a vital role in supporting native speakers, especially Taiwanese Indigenous peoples, in conserving and revitalizing their endangered native languages.

As languages are seen as key elements for cultural sustainability, this paper aims not only to provide an integrated review of the "National Language Development Act" but also to contribute to the formulation of efficient and effective solutions for promoting linguistic diversity in Taiwan and around the world.