Sentence:  If the Union conceded this to them , the same right must be conceded to each remaining state whenever it saw fit to secede : This would <WSD>destroy</WSD> the federal balance between it and the states , and in the end sacrifice to the sovereignty of the states all the liberty the citizens had gained by their Union . 
Meaning of the word marked with <WSD> tags:  do away with, cause the destruction or undoing of