The content of history textbooks and curriculum is an important factor in the political socialization of succeeding generations of students. This study of representative classroom textbooks authorized for use in Ontario at three distinct eras of the 20th century shows how the main lines of interpretation have shifted over time. During the pre-World War II era, the persistent underlying tone was one of reverence for Canada’s connection to Britain. By mid-century, the main theme was Canada’s bilingual dualism within North America. As the end of the 20th century loomed, the textbook authors were focusing much more on previously marginalised groups within the Canadian multicultural mosaic. Each era produces its own historical narrative, but within the school context, an authorized interpretation impacts the beliefs of the generation to follow. The ultimate goal must be to nurture democratic citizens of the global future with a sure understanding of their own national identity.