Ted is a world traveller. This summer, however, he decided to see the good old U.S.A.
On his vacation he went to the northernmost, southermost,
easternmost and westernmost points in the U.S. (not necessarily in that order).
He did it without ever crossing a landborder between states and only leaving U.S. controlled territory once.
How did he do it?
He lives/went to Alaska and he's already northernmost and Alaska is West and East of the 180 degrees line so now he just has to go to southernmost point. That is Hawaii and he only left U.S. territory once and never crossed a land border.