Resumen: This paper analyses the persistence of the shock caused by the American Civil War on the relative city size distribution of the USA. Two features make the study of this conflict interesting. First, it took place at an earlier stage of the industrialisation and urbanisation processes than those previously analysed in the related literature. Second, the battles were fought in the open field, not in urban areas. In line with previous results for the Second World War in Japanese and German cities, our findings suggest that the effects of the shock were transitory. Furthermore, some evidence regarding the possible presence of a ‘safe harbour effect’ is reported. Idioma: Inglés DOI: 10.1177/0042098014553553 Año: 2015 Publicado en: URBAN STUDIES 52, 16 (2015), 3070-3085 ISSN: 0042-0980 Factor impacto JCR: 1.934 (2015) Categ. JCR: URBAN STUDIES rank: 8 / 39 = 0.205 (2015) - Q1 - T1 Categ. JCR: ENVIRONMENTAL STUDIES rank: 36 / 104 = 0.346 (2015) - Q2 - T2 Factor impacto SCIMAGO: 1.56 - Urban Studies (Q1) - Environmental Science (miscellaneous) (Q1)