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This article explains the positions taken by national political parties on the issue of European integration over the period 1984–96. Based on the theory of party systems developed by Lipset and Rokkan, we develop a cleavage account of party response to new political issues. We hypothesize that European integration is assimilated into pre-existing ideologies of party leaders, activists and constituencies that reflect long-standing commitments on fundamental domestic issues.
Marks et al. (2000) studied this question.