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Plaid Cymru, political party that has sought self-government for Wales and worked for the protection and promotion of Welsh language, culture, and traditions. More a social movement than a political party in its early years, Plaid Cymru was founded in 1925 in response to a perceived threat to Welsh language and culture posed by the increasing official use of English in Wales. During the 1920s and ’30s, when economic turmoil and social change dominated the...