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American society is undergoing unprecedented cultural changes in the 21st century. This social transformation began with the civil rights movement in the 1960s. As the United States becomes more diverse, both racially and ethnically, equal access to a variety of social institutions and organizations becomes more challenging. With respect to marriage, popular media continually report the blurring of boundaries between racial and ethnic groups. As a result, there has been a tremendous increase in interracial dating and marriage over the past several decades. There are considerable differences between the occurrence of interracial dating and interracial marriage. Data suggest that there is a much higher level of interracial dating in comparison to interracial marriage. This research effort focuses on trends in interracial marriages in the United States between 1980 and 2006. Information from the U.S. Census Bureau was used to analyze changes in the number and frequency of interracial marriages in American society over a 22-year time frame. Differential assimilation is employed for understanding interracial marriage trends and distinguishing important statistical differences between marriages with a Black spouse and those interracial marriages not involving a Black spouse. This exploration provides important empirical findings for assessing the progress of assimilation in America.

In the current study, we extend the gene-by-environment interaction (cGxE) literature by examining how a widely studied polymorphism, the MAOA upstream variable number tandem repeat (MAOA-uVNTR) interacts with distal and proximal stressors to explain variation in crime and delinquency. Prior research findings have revealed that MAOA-uVNTR interacts with single indicators of environmental adversity to explain criminal behavior in general-population and incarcerated samples. Nevertheless, the genetically moderated stress sensitivity hypothesis suggests that increased risk for criminal behavior associated with variation in the MAOA-uVNTR can be best understood in the context of both distal stress during childhood and proximal stress in adulthood. Therefore, we employed Tobit regression analyses to examine a genedistal-proximal environment (CGxExE) interaction across gender in a sample of university students (n = 267) and with data from the National Longitudinal Study of Adolescent to Adult Health (Add Health; n = 1,294). The results across both sets of analyses demonstrate that variation in the MAOA-uVNTR interacts with distal and proximal stress to lead to increased risk for criminal behavior in males. Although proximal life stress is associated with an increase in crime and delinquency, this effect is more pronounced among MAOA-L allele carriers that have experienced distal stress.

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