Polls and perception is one thing, but it is in error given the fact that the majority of the ships we've seen on screen since about 1988 have been not exclusively American names.
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Other countries have Presidents, France for example. Why should it be Prime Minister and not Chancellor?
Your own implicit bias is showing.
I think it's pretty obvious the reason all or most of the Earth time travel stories happens in the U.S is practicality . If we can agree on this maybe we can reach a middle ground. Maybe I'm exaggerating the US centric aspects and I would conceed that . But I think the fact IT is a US made show means a lot of the production would slant from that perspective.