Final answer:
Casa is abiding by her ethnic group's rules of endogamy by marrying within her social group. Endogamy is common in many societies to maintain cultural and social continuity. This practice is often contrasted with exogamy, which involves marrying outside one's social group.
Step-by-step explanation:
Casa is following her ethnic group's rules of endogamy, which dictate that members of a society or culture should marry within their own social group or category. This contrasts with exogamy, where individuals are encouraged or required to marry outside of their social group or category. Endogamy is a social system where marriage within the same group, caste, or ethnicity is preferred and, in many cases, expected as a means to maintain the social and cultural continuity of that group.
In many societies, marriage is more than a personal union between two individuals; it's a complex institution that fulfills economic, social, and cultural functions, including the transfer of wealth, rights, and responsibilities. Arranged marriages, as in the case described, are often a means of perpetuating these social structures and can be a significant part of maintaining social order and familial ties.
Historically and across cultures, family compadrazgo, and endogamous and exogamous rules are central to understanding patterns and customs of marriage and social bounds. While love and compatibility are modern bases for marriage in many cultures, the social and familial rules still hold sway in numerous communities, influencing marital choices and practices.