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5/5 Conclusion: avoid making bold statements about "human universals" relating to marriage, about why monogamy emerged, etc. Read some anthropology instead 
What are your top three generalizations about human mating patterns that are empirically warranted?
Being hyper-cautious 
I'd say:
1. there is substantial variation in mating behaviour within and across societies;
2. variation in marriage systems (defined as in the map) does not map neatly onto variation in mating behaviour;
3. the role of historical processes is non-trivial.
Some related discussion is in Fortunato, L. (2015) Evolution of marriage systems. In Wright, J. D. (Ed.), International Encyclopedia of the Social & Behavioral Sciences, 2nd ed., Vol. 14, pp. 611-619. https://doi.org/10.1016/B978-0-08-097086-8.81059-4 …
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Evolutionary anthropologist here. Few things are "universal" about marriage, and the social enforcement of monogamy ain't one of them 
See e.g. the distribution of marriage systems across the ethnographic record 
--- it's complicated!