Who's Been Running The United States?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Countries with a coast used to claim 3 miles from their coast as their territorial waters, and reserved the right to police i.e. board and examine all ships within their waters. However foriegners could pass through territorial waters without having to present passports or observe that countries customs, unless to boarded.
Thus there is a difference between national borders and territorial waters. The 3 mile limit came about because that was the maximum range of a shore bound cannon. Nowadays countries can and do unilaterally claim much greater distances to preserve fishing stocks and to lay claim to oil and minerals under the sea bed.
So there is a difference between a countys borders, where those crossing are subject to inspection and control, and territorial waters which are generally open for all to pass through.