Expansionists were very patriotic American citizens that wanted to spread and expand in all directions because they believed in manifest destiny.
This is called Coastal Erosion and it is a combination of wind, tides, waves action on the shoreline. Beach ecosystem is constantly changing due to these circumstances and that is why these regions need special protection. In the US, Pacific coast of North West is a great example of this phenomenon.
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Answer: The Southern Ocean
Explanation: The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica.
