Any of these things happen in the time interval from the title:
A constitutional amendment is passed and adopted
There is an emergency presidential succession. IE vp or someone else suddenly becomes president outside of the normal schedule
A nuclear weapon explodes in the USA of at least 50 kilotons
A disaster strikes killing at least 10k people. Diseases count, quakes, volcanos etc. Manmade and natural
An attack by a terrorist or nation or individual kills at least 3k people in the usa
$collapse means the inflation rate is greater than 100% annualized for at least a month
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@RobertCousineau I interpret the leading USA... " as applying to all. All claims except that one mention that also. So I'm thinking yes all items must happen to or effect the us. For the disaster, it can be world wide but the specific harm mentioned has to happen at least to the USA