In this article, we will look into how peace has been won in Northern Ireland. In the beginning, we will briefly describe the ethnic structure and its historical development there. We will then examine some external explanatory variables, including the attitudes of the United Kingdom, Ireland, the United States, and even that European Union. Our next step will be to explore the positions of most important political actors, including that of the peace movement activists. Furthermore, we will investigate the Belfast Agreement and judge whether it has provided for any incentives for peace-making. Finally, we will arrive at how the experience in Northern Ireland may inspire Taiwan.