The American Revolution created not one country but two: the United States and the northern colonies that became Canada. For the next 250 years, Canadians defined themselves both through their closeness to America and their resistance to it. In this sweeping and timely history, Asa McKercher traces a relationship shaped by invasion and alliance, annexation scares and free trade, shared wars and competing national dreams. From the Loyalists and the War of 1812 to Confederation, continental defence, Vietnam, NAFTA, and Donald Trump's threats to make Canada the fifty-first state, McKercher shows how people, money, ideas, and culture have always crossed the border--even as Canadians repeatedly struggled to preserve a country of their own. At a moment when the old assumptions of Canada-US relations are collapsing, Canada: An American History explains how we arrived here--and what two and a half centuries of conflict, cooperation, attraction, and anxiety can tell us about what comes next.