From the fact that the eastern border of Texas was not part of the Compromise of 1850, it can be inferred that the issue of Texas's eastern border was not a significant concern or point of contention during the negotiations of the Compromise.
The Compromise of 1850 primarily focused on addressing the balance of power between free states and slave states in the aftermath of the Mexican-American War and the acquisition of new territories. Key provisions of the Compromise included allowing California to enter as a free state, the establishment of the territories of New Mexico and Utah, the abolition of the slave trade in Washington, D.C., and the implementation of a strict fugitive slave law.
The omission of Texas's eastern border from the Compromise suggests that this particular issue did not carry the same weight or significance as the other matters being addressed. It indicates that the negotiators did not see the eastern border of Texas as a subject that needed immediate resolution or had the potential to spark intense controversy or disputes.
This absence of attention may be attributed to the fact that the eastern border of Texas had already been established in the 1845 annexation agreement between Texas and the United States. Therefore, there may have been a general consensus or acceptance that this issue had been settled, and it did not require renegotiation or discussion as part of the Compromise of 1850.