Yes, u may think it is impossible. But, that's when it usually happens. Today, they think it be impossible for the US dollar and USA coastal Empire - East Coast to the West Coast - to collapse. That is usually when it happens. When the US dollar is ending it's reign, look to Cryptocurrency to take it's place. This is because it is very easy to replace fiat currency with digital one that everyone can use immediately. What will cause this, is the merchants, will find the fiats are becoming unpredictable. If the USD is out, you will have all the other fiats trying to be the lowest for the largest export advantage. The opposite would be there is too many other fiats competing against each other and they end up dis-stabilizing the world currency market. This in turn should eventually bring a Bitcoin price explosion.
Here's the picture of the USA splitting up due to economic turmoil or catastrophe. The East Coast will join once more to Britain n Canada to create economic bloc, since Britain needs one to compete with EU, after they have left. The West Coast is likely to join Japan to create a new bloc for defensive and economic reasons. They would need to staff off North Korea and China economic might. The West Canada may break off to join them. For the middle USA, they have to join with Mexico to be competitive.
The break up or weakening of the USA is likely to happen due to the Afghan curse. I call it that because 2 empires have lost their integrated empires. They are Britain, USSR and now USA. Some do not realize Great Britain fought the Afghans in 3 wars, last in 1919. Since then, they became weaker and weaker, till by the end of WWII, they could no longer keep the colonial empire. U know what happen to USSR after fighting them also in the 1980s.
So I'm going to say it's a matter of time, before the USA is broken up. In which way exactly, not sure. The above is one possibility. But fate have decided to weaken the USA. It may not even be a breakup, but some kind of catastrophe that weaken the US economically as nothing has done before. I think it is likely a breakup in one form or another. For example, Washington DC is wiped out, and the States do not agree to stay united.
** Disclaimer This blog is based on my opinions. I am not giving professional advice. Anything written here should be taken as an opinion and is the responsibility of the reader to take due diligence as such. Basically saying I may be wrong, right or neither, just saying its my opinions and my voice.