What came to my mind is that Puerto Rico hasn't even gotten in yet. Key West tried succeeding [sic]. So it seemed to me not simply something Californians get to vote on so I thought I'd look that up.
No, the Key West creation of the Conch Republic (Konk) was symbolic, to protest the Reagan Administration's blocking the only road to the Keys, to conduct vehicle searches for drugs & illegals. Thereby seriously damaging the tourist trade on which the Keys depend. The roadblock was subsequently removed. Key West has continued the practice as a tourist gimmick to illustrate its remoteness & uniqueness, and other Keys have joined a loose confederation with them.
In the 1990s the Conch Republic even declared "war" on the US, promptly surrendered after 1 minute, and then asked for $1 billion in reparations. Similar to the plot in the Peter Sellers comedy movie The Mouse That Roared
. So you see it is largely tongue-in-cheek, although born out of making a political & economic statement.