“…Despite their similarities, Saint-Martin and Saint-Barthélemy have historical, economic, and social differences: (i) in 2016, the Growth Domestic Product was 40000 euros/capita in Saint-Barthélemy, whereas it was 16000 euros/capita in Saint-Martin [45,47]; (ii) since 1986, the population growth was 25 significantly higher in Saint-Martin than Saint-Barthélemy [44,47], even if it was almost similar in 1960; (iii) the protection of populations against natural hazards benefited from a Natural Hazard Prevention Plan (called Plan de Prévention des Risques Naturels, PPRN in French [62]) implemented in 2011 in Saint-Martin but not in Saint-Barthélemy; and (iv) the economic strategies of both islands were different (quality/quantity and luxurious/mass for Saint-Barthelemy vs. Saint-Martin) [55,63],…”