Do you think in the future US will split into two or even more countries?

I am living in the U.S and so far no, if the U.S splits there are going to be a lot of protests. Unless another Civil War comes along then no.

why split

Maybe

No, I know they have been talks about or people will use it as idea for political reasons but nothing ever comes of it.

It depends on how much timelime we are talking about. In short and medium term? Nope. The whole Republican x Democrats differences aren't enough divide even if people paint this way. It's not even close to slave x no-slave division.

Long term? Who knows. This is more of a thought experiment than reality.

The trend seems to be avoiding separatism as much as possible. The last two cases were South Sudan and Kosovo. I think the only peaceful cases that are recent would be in Micronesia nations and they had support from other key countries. With this in mind, places that want to separate needs external support and the ability to defend itself.

Also, It will be interesting if places like Scotland and Catalonia can separate in a peaceful manner. If they manage to do it, maybe it could create a cascading effect and could affect Canada first and then maybe USA could be next in this scenario. Although there is no legal mechanism for any state to get off Union, so even in this case, it seems not feasible.

In the really long term, some drastic events could happen and maybe conditions similar to the civil war could arise. The best scenario for this would be a systematic failure of central government to provide security against external threats, loss of hegemony over the sea lines, and constant influence from other nations to support separatist movements.

In this scenario I'd think Hawaii, Puerto Rico, and islands like Guam would leave first (as independent nations or as a puppet from other regional power). On the continental side, people bring up California or Texas, but I think Alaska could have a better shot at leaving. After that, block of states could form and leave.

California and Texas have some internal securities they would need to solve in other to be stable. I imagine they would either spearhead a block of states or if they go solo, they would need to invade other states to secure enough buffer and water. Alaska is a better case because they don't need to do much to secure its borders. Even a small population could feasible defend it with some external support. Meanwhile California and Texas may talk a lot about leaving, but their geopolitical situation after leaving would be precarious. They would need a lot in order to guarantee a proper independence.

In the end it is a lot of ifs to just have some places to secede. USA as a political entity is pretty stable. The state doesn't need to go full on China or Russia to keep control of its territory integrity.

Who knows if they will split but I'm 99% sure we are gonna see another civil war in the next few years