I don't disagree however my posts were in context to the OP's assertion of "what would US of A do with a rogue Texas? nothing." And clearly the US did something. Also as disappointing as Reconstruction was it was in fact responsible for creation of the 13th, 14th and 15th amendments to the U.S. Constitution aka the "the Reconstruction Amendments."[1] The important of which can not be overstated. Surely those should be factored in to any judgement of "failure", no?
[1] https://en.wikipedia.org/wiki/Reconstruction_Amendments