During the nineteenth century, the transpacific world underwent profound transformation, due to the transition from sail to steam navigation that was accompanied by a concomitant reconfiguration of power. This book explores the ways in which diverse Mexican, British, Chinese, and Japanese interests participated, particularly during Porfirio Diaz’s presidency at the peak of Mexico’s participation in the steam network: from its 1860s outset through a time of many revolutionary changes ending with the World War, the Mexican Revolution, the opening of the Panama Canal, and the introduction of a new maritime technology based on vessels run by oil. These transoceanic exchanges, generated within these new geographies of power, contributed not only to the formation of a transpacific region but also to refashioning the Mexican national imaginary. With transnationalism, global and migration studies as its main framework, this study draws upon a dazzling array of primary sources to center Mexico’s transpacific relations and the influence they wielded over the region at the height of the steamship period.