History

Plans for a fixed crossing at Detroit dated back decades before the Ambassador Bridge was built; ferry traffic across the strait — the Detroit River being less than a mile wide at this point — had been a reliable but slow conduit since the nineteenth century. The breakthrough came when the Detroit International Bridge Company secured both American and Canadian approvals for a suspension bridge in the mid-1920s, at a moment when the automotive industry was transforming Detroit into one of the wealthiest cities on the continent.

Construction proceeded from both shores simultaneously over several years. When the bridge opened on 11 November 1929 — Armistice Day — it was celebrated as an engineering triumph and a symbol of the commercial partnership between two nations. The timing was, however, inauspicious: within days of the opening ceremonies, the stock market crash that had begun weeks earlier was reshaping the industrial economy the bridge was built to serve.

Through Depression and war the bridge remained the busiest international crossing in North America, carrying automotive parts, raw materials, and, during the Second World War, strategic supplies moving between Michigan factories and Canadian processing facilities. The bridge changed hands within the Moroun family over subsequent decades and remained a flashpoint in debates about infrastructure ownership, border security, and the Gordie Howe International Bridge — a publicly owned crossing recently completed or nearing completion nearby — which offers a publicly managed alternative.