Sentence:  Subsequent to the re-organisation of Scottish local government in 1973, West Central Scotland effectively became the urbanised industrial heartland of <WSD>Strathclyde</WSD> Region which focused upon the area previously known as the  Clydeside... 
Meaning of the word marked with <WSD> tags:  A former local government region in the west of Scotland, created in 1975, abolished in 1996.