When did Texas joined the union?

Texas v. White, 74 U.S. 700 (1869) was a significant case argued before the United States Supreme Court in 1869. The Court held in a 5–3 decision that Texas had remained a state of the United States ever since it first joined the Union, despite its joining the Confederate States of America and its being under military rule at the time of the decision in the case. It further held that the Constitution did not permit states to secede from the United States, and that the ordinances of secession, and all the acts of the legislatures within seceding states intended to give effect to such ordinances, were "absolutely null".