Question

In the united states today, very few people marry outside of their own socioeconomic class, suggesting that there is a high degree of:

Answer 1

I believe the answer is: Endogamy

Endogamy refers to a custom that require the people to be married only to someone from their close social group.
For most endogamous society, the parents of the couples would most likely played a huge influence in the coupling, which resulted in less free will between the couple