Nope state soverignty is explicitly recognized by the supreme court of the united states. It is said to be garunteed by the 10th amendment.
One such quote:
"But the Court found that “there are attributes of sovereignty attaching to every state government which may not be impaired by Congress, not because Congress may lack an affirmative grant of legislative authority to reach the matter, but because the Constitution prohibits it from exercising the authority in that manner.”