A very strange comment that carried to it's logical conclusion would blow your states-rights position to hell.
By agreeing to abide under the constitution new states agreed to all of it's tenants and were granted identical privileges and responsibility as the first 13 states. There is no "Seniority" clause in the Constitutional provision to admit new states and no "greater" or "lesser" states based on longevity. All are equally bound under identical conditions be it Delaware or Hawaii.
No mention of "seniority clause". The Articles of Confederation were replaced by the Constitution, no?