You are confusing geographical position with countries.
Countries are not a continuum, they start and end at some specific line defined by constitutions, mutually agreed by neighbours (or disputed through war and diplomacy) Colours have no such incentive for strict unified definitions, so there is no point at which blue ends.
I'm not confusing anything. I am 1000% unconfused and entirely on the same wavelength as OP.
You're inability to wrap your head around the analogy is tantamount to.. Not being able to comprehend blue-green.