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OK to what degree could a human nation or civilisation function entirely based on the sea. By this I mean not just that it takes most of its resources from the sea but that it lives entirely on the water with birth death and everything between taking place on ships and men, women and children alike dwelling on them. They would presumably build these ships on land but otherwise as much as can be done on the wave the better.
The best way I could think for this to start would be some persecuted ethnic group ethnic group which for whatever reason cannot find any other refuge or group of pirates to develop into it. Any ideas.