33 that Cubans have maintained strong ethnic ties in order to wield political power. Other important variables within Gordon's assimilation model are structural and behavioral assimilation. He distinguishes between the two by indicating that behavioral assimilation occurs when the ethnic group or individual takes on the behavioral characteristics and norms of the host or core culture. Structural assimilation occurs when there is socioeconomic equality between the migrants and members of the majority culture. When structural and behavioral assimilation occur, all other variables of assimilation follow (Gordon, 1964). One of Gordon's major contributions to the theoretical construct of assimilation is his work with social class as opposed to ethnic class associations. Stratification based on ethnicity is intersected by stratification based on social class and results in a group which he terms "ethclass." Theoretically, ethnic groups could contain the whole spectrum of socioeconomic classes. In reality, there is only a partial distribution of socioeconomic subgroups in each specific ethnic group. Gordon asserts at midcentury that social class similari ties are more important than ethnic group differences. Social partici pation in primary groups is confined to social class segments of one's own ethnic group. With a person of the same social class, but different ethnic group, one shares behavioral similarities but not a sense of peoplehood. With those of the same ethnic group but of a different social class, one shares a sense of peoplehood but not behavioral similarities (Gordon, 1964).