"The Sacred Egoism of Sinn Féin" by Ernest Augustus Boyd is a historical account written in the early 20th century, specifically during the aftermath of World War I. The book examines the political philosophy and actions of Sinn Féin, an Irish republican movement that played a significant role in advocating for Irish independence from British rule. Boyd explores the themes of national identity, self-determination, and the complex interplay of egoism among nations, particularly in the context of Ireland's struggle for autonomy. In this work, Boyd outlines the cultural and political landscape of Ireland, emphasizing the resentment the Irish people felt towards British imperialism and the disillusionment with the promises of freedom made by the Allies during the war. He argues that the ideals of democracy and altruism often fell short when confronted with the realities of imperial power dynamics, leading to a strong sense of national egoism within Sinn Féin. The book chronicles the evolution of Irish nationalism and the pivotal moments, such as the Easter Rising of 1916, that solidified Sinn Féin's stance against British rule. Boyd ultimately asserts that Ireland's pursuit of self-governance is an assertion of its identity as a nation that refuses to be overlooked in the global discourse on freedom and justice. (This is an automatically generated summary.)