WI No International Waters

WI the League of Nations or the UN decided that it would somehow be wise for the entire world, including the oceans, to be under some national sovereignty, and divided the oceans so that each country's territorial waters reached halfway to the nearest land point of the next country? (In this scenario, anything south of 60 degrees south latitude is under the Antarctic Treaty, as OTL.)

Some things to think about: The borders might not be where instinct tells us they "should" be. For example, Bermuda, not Europe, is directly east of the US, and Hawaii is due west of Mexico, not the mainland US.
 
The problem with waters being territorial is one of enforcement.

The origin of the 2 mile distance that territorial waters were when the Convention on the High Seas is said to be because that's as far as land-based cannon could fire when the treaty was written. The current 12 + 12 nautical miles is the product of improved radar and weapons technologies, mostly; the 200 mile exclusive economic zone is not considered to be national waters and is "international" in the legal sense aside from resource rights. And that's because, short of a large fleet of planes coupled with a largeish fleet of fast ships, there's no effective way for any nation to enforce laws over a large portion of sea.

Now, I guess you could get the EEZs extended in the way you're proposing, but...I'm not sure that Argentina, for example, is capable of or wants to enforce their fishing rights in the middle of the Atlantic, a thousand kilometers or more away from their coast. Even the US or the British Empire at the height of their power wouldn't want the responsibility.
 
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