Earth

How was the 12-mile limit of a country's boundary set?

More Questions from Earth
What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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Where is most of the earth's gold located?
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Where was the lowest world temperature, -128.6 degrees?
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Which star is the closest one to Earth?
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What is the imaginary line that runs around the Earth halfway between the poles called?
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In weather terms, what turns to water in a "spring thaw"?
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What is the world's highest mountain?
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Where is the type location for the Permian Period?
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