In Reasoning Otherwise, author Ian McKay returns to the concepts and methods of “reconnaissance” first outlined in Rebels, Reds, Radicals to examine the people and events that led to the rise of the left in Canada from 1890 to 1920. Reasoning Otherwise highlights how a new way of looking at the world based on theories of evolution transformed struggles around class, religion, gender, and race, and culminates in a new interpretation of the Winnipeg General Strike of 1919. As McKay demonstrated in Rebels, Reds, Radicals, the Canadian left is alive and flourishing, and has shaped the Canadian experience in subtle and powerful ways. Reasoning Otherwise continues this tradition of offering important new insight into the deep roots of leftism in Canada.