See but now we're really getting into specific things.
You can't call it "the most powerful position in the world" as some other heads of other countries can do similar things (I don't believe they call it executive order either, but it's the same idea).
Perhaps you can say something like... The President of the US being the most powerful head of a country (in relation to other countries, dur) since he/she has such a power, but then again as mentioned, others have similar powers.... But they're still not ruling over other countries. Just passing 'laws' (yeah, yeah, EOs) that affect relations between their country and others or what not.