My dissertation project, Mormons at the World's Fair: A Study of Religious and Cultural Agency and Transformation looks at a pivotal period of transition within the American religious and political national culture (1880-1907). Using Mormonism as an important focal point of national controversy and cultural change, this dissertation looks at the interconnections between Mormon transitions and the larger national transformations then under way in what historians call the "progressive" era. Prominent scholars have recognized the 1893 World's Fair as an important moment that helped initiate the "dawning" of religious pluralism in America. This national response to American religious diversity, however, is limited to a nineteenth-century historiographical framework, which made real religious pluralism in the next century more difficult. Bringing together into one narrative the story of the anti-polygamy crusades of the 1880s, the ambivalent presence (and non presence) of Mormonism at the World's Fair of 1893, and the drawn-out US Senate Hearings and ultimate victory of Mormon apostle and Senator Reed Smoot in 1907, this dissertation offers new insights into the meaning and limitations of American religious liberty, the dynamics of minority agency, as well as a deeper understanding of America's developing national identity.