>If this happens and Cuba decides to launch drones/missiles against the US homeland, it's not an exaggeration to say that Cuba is flattened and invaded that same afternoon.
I sort of think it maybe is an exaggeration, you're evidently of the opinion that the U.S happens to have enough battle ready troops with the requisite hardware positioned within a few hours of Cuba so that they can invade and flatten in the time it takes to fly from Miami to Havana?
I don't know, but a Destroyer would take about 10 hours to get from Florida to Cuba.
It seems your definition of invade and flatten is just dropping bombs, but that definitely does not handle the invade part of things, and it remains to be seen as to whether, with drones, being able to fly non-stop is the great technological advantage it once was.
Some preliminary evidence from around the world suggests in a drone led conflict it confers the ability to have expensive hardware destroyed and pilots killed non-stop.
Assuming the scenario happened the first bombing runs would be over after 2h and would continue for the next 48h until amphibious assault fast response finishes landing, by which time it’s safe to assume there isn’t much left to defend (though rubble makes a horrible war zone for the attacking side).
Cuba simply isn’t Iran. They’re a blockaded island with not much military experience. Iran is a huge mountainous country preparing for war for the last 40 years with first hand experience of getting blown up from above and from the inside by USA allies and surviving just fine.