Answer:
Caste system
Explanation:
The social stratification which is differentiated according to hereditary transmission, endogamy, rituals and social interactions is called a caste. Endogamy is a practice of selecting a partner for marriage who has the same social group, ethnic group, and caste as the person. It rejects the idea of marrying from some other social group.
Mira married someone who is of the smae race and background. This shows endogamy and the social stratification in this scenario is caste system.