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This question already has an answer here:

Why is Star fleet headquarters in San Francisco California, instead of New York city or Lyon France ? United Nations or Interpol represent international functions somewhat reflective of the Federation of Planets. San Francisco seems unlikely to be a historical and symbolic choice for the representation of unity of the earth. The UN and Interpol and it's geographical sites and purpose would serve as a better memory of Unity.

marked as duplicate by calccrypto, phantom42, KutuluMike, RedCaio, Rand al'Thor Jan 31 '16 at 2:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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  • Welcome to the SF&F site! Your question is a good question, +1. I looks like this is a duplicate of another question already asked by another user. Duplicates are not a bad thing, but in order to avoid this happening a lot you can try to search around before asking to see if it's already been asked. Also see the tour and the help center. :) – RedCaio Jan 31 '16 at 2:11