The Province of Westphalia () was a province of the Kingdom of Prussia and the Free State of Prussia from 1815 to 1946. In turn, Prussia was the largest component state of the German Empire from 1871 to 1918, of the Weimar Republic and from 1918 to 1933, and of Nazi Germany from 1933 until 1945. The province was formed and awarded to Prussia at the Congress of Vienna in 1815, in the aftermath of the Napoleonic Wars. It combined some territories that had previously belonged to Prussia with a range of other territories that had previously been independent principalities. The population included a large population of Catholics, a significant development for Prussia, which had hitherto been almost entirely Protestant. The politics of the province in the early nineteenth century saw local expectations of Prussian reforms, increased self-government, and a constitution largely stymied. The Revolutions of 1848 led to an effervescence of political activity in the province, but the failure of the revolution was accepted with little resistance. Before the nineteenth century, the region's economy had been largely agricultural and many rural poor travelled abroad to find work. However, from the late eighteenth century, the coal mining and metalworking industries of the Ruhr in the south of the province expanded rapidly, becoming the centre of the Industrial Revolution in Germany. This resulted in rapid population growth and the establishment of several new cities which formed the basis of the modern Ruhr urban area. It also led to the development of a strong labour movement, which led several large strikes in the late nineteenth and early twentieth century. After World War II, the province was combined with the northern portion of Rhine Province and the Free State of Lippe to form the modern German state of North Rhine-Westphalia. Early history Foundation and structure Napoleon Bonaparte founded the Kingdom of Westphalia as a client state of the First French Empire in 1807. Although named for the historical region of Westphalia, it contained mostly Hessian, Angrian and Eastphalian territories and only a relatively small part of the region of Westphalia. After the reconquest of the region by the Sixth Coalition in 1813, it was put under the administration of the . It was not until the Congress of Vienna in 1815 that the Province of Westphalia came into being. Although Prussia had long owned territory in Westphalia, King Frederick William III made no