I've seen in some videos that Texas has the right to split into 5 smaller states. If this is the case, and they didn't need congressional approval, why did they not split before the civil war?
First, southern states were competing with the north to catch more "slave states" or "free states." But a split Texas would just add 4 slave states to the union without question.
Second, the South might have been able to force Lincoln's loss in the election with this tactic. The electoral college mandates each state to have at least 3 electoral votes; Texas could have made 4 more "states" that are arbitrarily small. The original Texas would keep roughly the same population thus keeping the same number of electoral votes. And the 4 smaller Texases, with theoretically 1 person who votes democrat, would each have 3.
So why didn't Texas seize this opportunity?