The width of territorial sea decides the definite scope of territorial sea of states`. There is a process of development and expansion of width of territorial sea in the history. That is the necessary consequence of the development of modern society. Sea has more and more economic meanings. After Geneva Convention on the law of the sea in 1958, United Nations Convention on the Law of the Sea gives us a maximal width of territorial sea. 

Question:

Summarize the development and expansion of the width of territorial sea in the old days.