Abstract
The extension of social citizenship via modern social policies is a fundamental macrolevel social change of the past hundred years. This paper attempts to reorient the empirical study of social policy development from its present concentration on aggregated social expenditures to a focus on the multidimensional aspects of the development of welfare states, social rights, and social citizenship. On the basis of a new data set describing the development of citizens' social rights in the main social insurance programs in 18 OECD countries since 1930, causal hypotheses derived from pluralist industrial, neo-Marxist, popular protest, state autonomy, and power resources approaches are tested. On the crucial issue of the role of left government participation in the extension of social rights, the hypotheses of the power resources approach are supported.

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