You made the statement "that States like Arkansas and Even Texas would not have become Slave states had that not been the only way they could be admitted into the Union because of political decisions made in Washington."
Sounds like you're suggesting that territorial representatives of Arkansas and the Republic of Texas had slavery forced on them by Congress. If I mistake your intention, please accept my apologies in advance. The opposite was true. Both Arkansas and Texas had constitutions prior to statehood, and we can be certain that Texas explictly granted rights to those owning slaves. Someone can investigate Arkansas and its admission into the Union, the same should hold true there.
As mentioned, the opposite was true. Abolitionists knew that the admission of Texas as a slave state would restore parity in the U.S. Senate (which it did in 1848). They exerted much pressure in Washington to see that this didn't happen, but were eventually defeated.