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How did they decide what is West Antarctica and what is East Antarctica? Isn't it all North Antarctica?

Western hemisphere, Eastern hemisphere. Ultimately down to the 0 meridian running through Greenwich and for this you can thank English naval power.

Or you can thank the English for figuring out how to measure longitude.

Well yes :)

Greenwich is actually not a bad location to place the 0 meridian since it makes the international date line run through the least populated region of the world.

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