https://en.m.wikipedia.org/wiki/Texas_v._White https://en.m.wikipedia.org/wiki/Texas_v._White When, therefore, Texas became one of the United States, she enter

https://en.m.wikipedia.org/wiki/Texas_v._White https://en.m.wikipedia.org/wiki/Texas_v._White When, therefore, Texas became one of the United States, she entered into an indissoluble relation. All the obligations of perpetual union, and all the guaranties of republican government in the Union, attached at once to the State. The act which consummated her admission into the Union was something more than a compact; it was the incorporation of a new member into the political body. And it was final. Similarly, Catalonians and the rest of Spaniards approved their Constitution in 1978, which states that matters like this shall be voted in national referendum, once approved by congress.