The statement that most accurately explains why the creation of the Texas Constitution of 1876 was a political turning point in Texas history is: "It finally guaranteed that the rights of all Texas citizens would be protected."
The Texas Constitution of 1876 was created in the context of Reconstruction and aimed to establish a government that was more limited in power compared to the previous constitutions. It sought to protect the rights of citizens and emphasized a system of checks and balances. Although it did not fully achieve equality for all citizens, it was a significant step towards protecting the rights of Texans, addressing issues from the Civil War and subsequent Reconstruction era.
The other options do not accurately reflect the key implications of the 1876 Constitution. It did not specifically ensure the departure of the Confederate Army, it did not create a large state government, and while it did impose restrictions on voting rights for some groups at the time, it is more appropriate to emphasize the broader intent to safeguard citizen rights.