I think there is some stupid law about it not opening before September. We ran into this one other year also.
When it used to open in August they called it a special hunt or something not a “season”
Migratory birds don’t care where international borders are drawn so it’s a federal issue regarding the Sep 1 start date and ultimately goes through the Dept of Interior, which provides guidelines to the states as to when/how they can set their hunting seasons.
This also explains the “special hunt” wording for openers prior to Sep 1; any state would have to receive a special exception from the Dept of Interior to allow these hunts outside of the fed’s seasonal guidelines.