During the nineteenth century, Catalonia experienced economic and social change brought about by industrialisation and the move away from traditional manufacturing to modern industry. After the initial impetus in the eighteenth century, the process of industrialisation was slow and gradual until 1840, but after the First Carlist War, growth became spectacular. In the textile sector, the Catalan textile industry centred on traditional manufacturing sites such as Barcelona, Terrassa or Sabadell, where steam was used, or in areas with rivers, where water power was harnessed.