The Irish Land War (1879–82) represented a turning point in modern Irish history, a social revolution that was part of a broader ideological moment when established ideas of property and land ownership were fundamentally challenged. A striking aspect of the Land War was its internationalism, spurred by links between different emigrant locations and an awareness of how the Land League’s demands to lower rents, end evictions, and abolish “landlordism” in Ireland connected with wider radical and reform causes. Changing Land provides a detailed investigation of Irish emigrants’ multifaceted activism in Argentina, Scotland, England, the United States, and Ireland itself. It brings unfamiliar figures to the surface and recovers the voices of women and men who have long been on the margins of—or entirely missing from—existing accounts. Retracing these transnational lives reveals new layers of radical circuitry between Ireland and disparate international locations and demonstrates how the Irish land agitation intersected with a range of oppositional movements in the nineteenth century.