I don't think that this is a practical idea. If California, a state with two Senators, becomes two states with a total of four Senators, those two states will have more political influence in the Senate than the state of California has now, and other states would not like to see that, because more influence for California necessarily means less influence for them. So there would be too much political opposition. Also, the US Constitution does not describe any mechanism by which a state can split into two states. How do you do it - a referendum? It would probably be necessary, in order to satisfy legal requirements, to amend the US constitution in order to create such a mechanism, and constitutional amendment is difficult to do, and requires very broad national agreement, which is not likely in this case.
Split in two
caleroto
I am from California. Two bordering states of California are Arizona and Nevada.
illonis and indiana
North Dakota and South Dakota
Tennessee Kentucky
California
virgina
Baja California is divided into two of the 31 States of the United States of Mexico. It is divided because the two parts became states at different times.
It is bordered by the Mexican states of Baja California, Baja California Sur, Sonora, and Sinaloa.
Australia is divided into six states and two territories.
no