I still don't understand how the president can cancel any event in any state. They are virtually autonomous in these sorts of matters.
I would assume mt Rushmore is under federal authority due to it being a national park. U.S. park service Dept of the interior. NPS national park service. Unless they are launching the fireworks just off the edge of the park from SD land, but they could still complain about the fire hazard to the park.
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