We’ve written extensively about attachment styles1 in romantic relationships (for example, read here and here for more on this topic). In a nutshell, people who are anxious tend to intensely desire connections with other people and are worried that their partners will abandon them whereas those who are avoidant tend to be wary of closeness to others and often feel that their partners want to be closer to them than they would like. Anxiety and avoidance are forms of insecure attachment, and those who do not have these characteristics have a secure attachment.
Research on attachment styles in romantic relationships began in the late 1980s; more than 25 years of research on the topic has shown the importance of attachment for many aspects of relationship functioning. And now two decades of data on attachment researchers can ask, and answer, interesting questions about whether adult attachment styles have changed at the population-level over time. In other words, have American young adults become more or less secure since the late-1980s?