Throughout history the nations of the world with coastlines have relied to a lesser or greater extent on sea power.
The key role of the ships is economic. Using ships it is possible to transport goods to other countries where they can be sold for profit, or transport goods from other countries to home for the same reason.
Island nations, such as Britain, rely exclusively on sea trade when dealing with other countries, those with land frontiers as well as coasts are not so dependent on sea trade.
In time of war, sea trade becomes increasingly important. The economy of a nation can be seriously damaged if its sea trade is cut off.
Countries build warships to attack each other’s merchant ships and to protect their own. These warships are used to control the seas and dictate which ships are allowed to travel and which are not.
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