re: If secession was legal then what right did the North have to keep the South in the USA?

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False

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What do you mean false? I was referring to NOW, so you would be right that it was false at the time of the Civil War.

But in 1868, there was a SCOTUS decision:

Texas v. White

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When Texas became one of the United States, she entered into an indissoluble relation. The union between Texas and the other States was as complete, as perpetual, and as indissoluble as the union between the original States. There was no place for reconsideration or revocation, except through revolution or through consent of the States.

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