

You’re tripping yourself up on the difference between British English and American English. Canadian English is tolerant of both forms.
Oxford, where he wrote his thesis, would require ‘an’ before ‘historic’. When Governor of Bank of England, he would have had to have been careful to use British English.
If you’re a Canadian using American spelling and grammar checkers to define your language, you might wish to reconsider that. MS Word does have Canadian and UK English options.
I don’t think you needed [sic], just the comma that StarTrek.com omitted.
So, this is a big reveal - the scenario is a planet that has not been but now is a part of the Federation.
The viewpoint is civilian.
The resort workplace setting, like the old Loveboat or Fantasy Island, means that anyone can come by as the guest star.