So, to achieve the same practical end (to observe only the one of two time periods it currently observes which it cannot unilaterally choose), Washington state

So, to achieve the same practical end (to observe only the one of two time periods it currently observes which it cannot unilaterally choose), Washington state would instead propose changing its entire geographic time zone to Mountain Time, seeking approval from the Secretary of Transportation instead of Congress, on the bases laid out in that link, and then upon that entirely other approval which may or may not occur, unilaterally switch to Mountain Standard Time rather than Pacific Daylight Time… and it’s WA representatives who are being disingenuous? On the assumption that the other approval would be more forthcoming?