Guam is a low lying island that will be inundated long before the shift, and disappear afterwards in the rising sea level when the current poles melt. Such islands will get little help from the governments of the world, regardless of commitments due to its strategic location. Starving countries and lands disappearing under the rising waters will be ignored. Thus, those on Guam who would survive the coming earth changes need to help themselves, and make aggressive plans to do so.
Note Mariana/Bonin Islands commentary.