I do not see the word "sovereign" anywhere in the Constitution. It occurs in the Articles of Confederation.Actually the founding fathers almost entirely believed in the right of secession. Read the federalist papers and The papers written by their opposition. I cant think of the name yet. Our Constitution was meant to be a union of Sovereign states. read the writing of many of the prominent founding fathers. It was never meant to be a bond that could never be broken. In fact, Jefferson spoke that eventually even this government would need to be overthrown. It is man's nature to have governments become dictatorial.