The expansion of women's formal political representation ranks among the most significant trends in international politics of the last 100 years. Though women made steady political progress, substantial country‐level variation exists in patterns of growth and change. In this article, longitudinal theories are developed to examine how political factors affect women's political representation over time. Latent growth curve models are used to assess the growth of women in politics in 110 countries from 1975 to 2000. The article investigates how electoral systems, national‐level gender quotas and growth of democracy – both political rights and civil liberties – impact country‐level trajectories of women's legislative representation. It is found: first, national quotas do affect women's political presence, but at a lower level than legislated by law; second, the impact of a proportional representation system on women's political representation is steady over time; and third, democracy, especially civil liberties, does not affect the level of women's political representation in the earliest period, but does influence the growth of women's political representation over time. These findings both reinforce and challenge prior cross‐sectional models of women's political representation.

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This study extends research on the relationship between wealth accumulation and union experiences, such as marriage and cohabitation. Using data from the National Longitudinal Survey of Youth 1979, we explore the wealth trajectories of married individuals in light of their premarital cohabitation histories. Over time, marriage positively correlates with wealth accumulation. Most married persons with a premarital cohabitation history have wealth trajectories that are indistinguishable from those without cohabitation experience, with one exception: individuals who marry their one and only cohabiting partner experience a wealth premium that is twice as large as that for married individuals who never cohabited prior to marrying. Results remain robust over time despite cohabiters' selection out of marriage, yet vary by race/ethnicity. We conclude that relationship history may shape long-term wealth accumulation, and contrary to existing literature, individuals who marry their only cohabiting partners experience a beneficial marital outcome. It is therefore important to understand the diversity of cohabitation experiences among the married.

We use more than 20 years of data from the National Longitudinal Survey of Youth 1979 to examine wealth trajectories among mothers following a nonmarital first birth. We compare wealth according to union type and union stability, and we distinguish partners by biological parentage of the firstborn child. Net of controls for education, race/ethnicity, and family background, single mothers who enter into stable marriages with either a biological father or stepfather experience significant wealth advantages over time (more than $2,500 per year) relative to those who marry and divorce, cohabit, or remain unpartnered. Sensitivity analyses adjusting for unequal selection into marriage support these findings and demonstrate that race (but not ethnicity) and age at first birth structure mothers' access to later marriage. We conclude that not all single mothers have equal access to marriage; however, marriage, union stability, and paternity have distinct roles for wealth accumulation following a nonmarital birth.