In USA, I'm looking for outline of the Division 9 Pacific which consists of the following states:
Alaska California Hawaii Oregon Washington
I have got a map with the KML to generate for these states: https://drive.google.com/open?id=1lYAaPc-U3sv6hUlbhBsQJ0vzXfw&usp=sharing
But I just want the outline of the whole area and NOT the state borders. How can I get this?