Utopianism in practice : the American front of the French Revolution in Britain, 1789--1802 -- "The war of systems": print culture and the institutionalization of the political divide in the 1790s -- "Cultivators of the earth": the American crisis and the emergence of the freehold farmer, 1763--1783 -- "Rabies agri": or, wilderness for sale -- "The calculated rise of the American empire": the radicalization of American utopianism -- "The mania of emigration": new philosophers in the wilderness -- "The precious pearl of liberty": from Newgate Prison to Ohiopiomingo -- "Come to these Arcadians regions where there is room for millions": politics for the people -- "Look before you leap": the demonization of Jacobin America -- "Parrying the enemy with their own weapons": dystopianism and the popular discourse of fear -- Postscript : "mania reformatio" the demise of transatlantic utopianism.