What are the advantages of parental control over when and to whom a child marries?

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They can you the relationship to better their political relationships. old Chinese family's would basically sell off their daughters to men from important family's in order to better their standing in society. They would then have better access to more places and resources.

Explanation:

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery