The Congress System and the French Invasion of Algiers, 1827-1830

The Congress system that arose in Europe after the Napoleonic Wars facilitated European imperial expansionism throughout the nineteenth century. Yet, the ties between that system and expansionism have rarely been unwound and studied in detail. Taking the French invasion of Algiers in 1830 as a case in point, this article shows how the Congress system's shared discourses of security and threat perceptions as well as its common practices of concerted diplomacy fostered European imperialism in North Africa. The article emphasizes obscured continuities and understudied multilateral diplomatic efforts. It uncovers the ways in which the post-1815 system decisively shaped the aims, justifications, and execution of the French war against Algiers. European, North African, and Ottoman actors each furthered or contested the idea that the invasion was part of an international legacy dating back to the Congress of Vienna, related to the concerted repression of North African ‘Barbary piracy’. In bringing these connections to light, it becomes apparent that the post-1815 international system cannot be understood in isolation from nineteenth-century imperialism.