Northumberland role in the Industrial Revolution from the 18th century on. Many coal mines operated in Northumberland until the widespread closures in the 1970s and 1980s. Collieries operated at Ashington, Bedlington, Blyth, Choppington, Netherton, Ellington and Pegswood. The region's coalfields fuelled industrial expansion in other areas of Britain, and the need to transport the coal from the collieries to the Tyne led to the development of the first railways. Shipbuilding and armaments manufacture were other important industries before the deindustrialisation of the 1980s. Northumberland remains largely rural, and is the least-densely populated county in England. In recent years the county has
Jackson County, Colorado Jackson County, Colorado Jackson County is a county in the state of Colorado. As of the 2010 census, the population was 1,394, and it was the fourth least-densely populated in the state. The county seat and only municipality in the county is Walden. Most of Jackson County is a high relatively broad intermontane basin known as North Park, which covers . This basin opens north into Wyoming and is rimmed on the west by the Park Range and Sierra Madre Range, on the south by the Rabbit Ears Range and the Never Summer Mountains, and on the east by the