From Wikipedia
Scotland's transformation into a rich leader of modern industry came suddenly and unexpectedly.[37] The population grew steadily in the 19th century, from 1,608,000 in the census of 1801 to 2,889,000 in 1851 and 4,472,000 in 1901.[51] The economy, long based on agriculture,[52] began to industrialize after 1790. At first the leading industry, based in the west, was the spinning and weaving of cotton. In 1861 the American Civil War suddenly cut off the supplies of raw cotton and the industry never recovered. Thanks to its many entrepreneurs and engineers, and its large stock of easily mined coal, Scotland became a world centre for engineering, shipbuilding, and locomotive construction, with steel replacing iron after 1870.[53]
Nevertheless, there never were enough high-paying jobs, so during the 1841-1931 era, about 2 million Scots emigrated to North America and Australia, and another 750,000 relocated to England.
