[Hulka]

“They do allow TX to split into up to five states.”

Can you provide link for that?

Thanks.

[Sherman Logan]

Third -- New States of convenient size not exceeding four in number, in addition to said State of Texas and having sufficient population, may, hereafter by the consent of said State, be formed out of the territory thereof, which shall be entitled to admission under the provisions of the Federal Constitution

https://www.tsl.state.tx.us/ref/abouttx/annexation/march1845.html

However, it should be noted that this provision was more or less redundant, as any state can be split into two or more states by action of its legislature and Congress.

Article IV, Section 3: "New states may be admitted by the Congress into this union; but no new states shall be formed or erected within the jurisdiction of any other state; nor any state be formed by the junction of two or more states, or parts of states, without the consent of the legislatures of the states concerned as well as of the Congress."

The only difference I can see is that TX can split itself without congressional approval. But then the new states would still have to petition for entry into the Union.