The peoples right to leave?

What is the only state in the union of the United States that has the right of succession as defined in their state constitution? That would be Texas, the lone star state. Now when I mention this most people laugh and say that even if Texas wanted to do that, that the rest of the nation wouldn’t allow them to leave. Well this brings up the questions does a specific area if that area is large and has a substantial majority with in it have the right to make a new government with few if any ties to their previous government? In my opinion they do as long as they have true grievances against their mother nation. One example of this would be Tibet against China, you see Tibet has attempted to secede from China for a while now and ever time they get close or even attempt to peacefully protest China sends in the troops to break it up, imposing marshal law and killing anyone who refuses to do what they say. It is these types of things that would constitute actually grievances that might even call for a violent revolution against such a suppressive government. Currently, China has said that if they do not surrender to the punishment of China for trying to peacefully protest that eventually led to violent riots in the streets because of the presence of Chinese troops. So I would support any group that has actual grievances against a government such as suppression and hatred of their beliefs instead of just wanting to rule your own society and acting on it on a whim. This is my belief when it comes to the United States, which all states have an inherent right to succeed; however the other states also have the right to do everything in their power to prevent it short of starting a civil war, except when it is absolutely necessary.