Chartism was a working-class movement for political reform in Britain which existed from 1838 to 1858. It took its name from the People's Charter of 1838 and was a national protest movement, with particular strongholds of support in Northern England, the East Midlands, the Staffordshire Potteries, the Black Country, and the South Wales Valleys. Support for the movement was at its highest in 1839, 1842, and 1848, when petitions signed by millions of working people were presented to the House of Commons. The strategy employed was to use the scale of support which these petitions and the accompanying mass meetings demonstrated to put pressure on politicians to concede manhood suffrage. Chartism thus relied on constitutional methods to secure its aims, though there were some who became involved in insurrectionary activities, notably in south Wales and Yorkshire.