First, they used immigration to show the impact it has on racial and ethnic identification. Changes to immigration laws have helped shift the demographics of more than one category. The influx of educated immigrants and the skills they bring with them have helped to evolve the category typology of the groups to which they belong, and have also helped to evolve the relative position of these groups in the social order. As the changing economic and educational outcomes of immigrants expand the boundaries of each category, it leads to increased heterogeneity between and within racial and ethnic groups. Changing immigration also results in changing social relations within and between groups, as it leads to increased interracial interactions in schools, workplaces, and households. This also moves the boundaries of this category. Second, the authors use multiracialism or hybridity, which is the ability of individuals to fit into multiple categories. It is found that over time individuals identify with multiple racial and ethnic categories, this is due to increased similarities between shared elements assigned by different groups. The increased interaction between the groups led to the identification of these similarities and therefore modified not only the typology of the categories, but also the