Final answer:
Marty is encouraging his daughter to follow the practice of endogamy, marrying within her own faith, which reflects historical norms of societal decency and contemporary issues of religious discrimination.
Step-by-step explanation:
Marty expressed a desire for his daughter to practice endogamy, which is the custom of marrying within one's own group, society, clan, or tribe to maintain a pure lineage, often on the grounds of maintaining religious or cultural integrity. By insisting that his daughter marries only within their faith, Marty is enforcing a form of social boundary that has existed throughout history. Historically, marriages were often arranged to ensure that certain social or religious norms were upheld, and this practice was linked to the idea that a marriage should be something that adheres to societal values of decency and morality. In contrast, Marty's ultimatum also reflects contemporary issues like religious discrimination, where individuals are treated unfairly or differently because of their faith or that of their spouse.