Does Harvard prefer US History to World History?

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Yes, I’m sure. Unless you opt for Advanced Standing, Harvard doesn’t grant credit for AP’s (except for scoring a 5 on an AP Foreign Language exam). See: https://college.harvard.edu/frequently-asked-questions

Can I fulfill academic requirements with previous coursework?
You cannot receive credit for coursework completed before matriculation, but Harvard offers an Advanced Standing Program to entering students who meet certain standards on the College Board Advanced Placement (AP) examinations or who have earned the full International Baccalaureate Diploma with a grade of 7 on at least three Higher Level examinations. Admitted students with strong results on internationally recognized examinations, such as the GCE A-levels, Abitur, or French Baccalaureate, may submit their credentials to the Advanced Standing adviser for individual evaluation upon matriculation. Visit the Advising Programs Office website for more information about Advanced Standing.