Y Democratiaid Cymdeithasol (DU): Gwahaniaeth rhwng fersiynau
Cynnwys wedi'i ddileu Cynnwys wedi'i ychwanegu
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Llinell 1:
{{Infobox political party
|country = Y Deyrnas Unedig
|colorcode = {{Social Democratic Party (UK)/meta/color}}
|logo = [[File:SDP Logo.png|center|200px|SDP logo]]
|ideology = ''Centrism'',<br>Rhyddfrydiaeth-Cymdeithasdol<ref name="Driver2011">{{cite book|author=Stephen Driver|title=''Understanding British Party Politics''|url=http://books.google.com/books?id=2_Qq6RJr6_QC&pg=PA117|accessdate=20 July 2013|date=16 Mai 2011|publisher=Polity|isbn=978-0-7456-4077-8|pages=117–}}</ref><ref name="Adams1998">{{cite book|author=Ian Adams|title=Ideology and Politics in Britain Today|url=http://books.google.com/books?id=_7t714alm68C&pg=PA63|accessdate=20 Gorffennaf 2013|year=1998|publisher=Manchester University Press|isbn=978-0-7190-5056-5|pages=63–}}</ref>
|national = [[Y Gynghrair SDP-Rhyddfrydwyr]]
|international =
|split = [[Y Blaid Lafur (DU)|Y Blaid Lafur]]
|merged = [[Y Democratiaid Rhyddfrydol]]
|successor =
|colours = Glas a coch
}}
Roedd '''Plaid y Democratiaid Cymdeithasol (SDP)''' yn blaid wleidyddol ganolig yn y Deyrnas Unedig a grëwyd ar 26 Mawrth 1981 ac a oedd yn bodoli tan 1988.
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