美國南達科他州屬於東岸定係西岸？

The only states on 西岸 are: (north to south) Washington, Oregon and California.

吾係好記得,不如你自己上網查啦~~

http://zh.wikipedia.org/wiki/%E5%8D%97%E9%81%94%E7%A7%91%E4%BB%96%E5%B7%9E

東岸

The only states on 西岸 are: (north to south) Washington, Oregon and California.
Alaska is up north and Hawaii is in the middle of Pacific Ocean.