GTT, You have to belong to a ND USA club if non-resident to wrestle in the ND State USA tourney. If you are ND resident, you don't have to belong to a ND USA club to wrestle in the State USA tourney. However you will need a USA Athlete card to wrestle either way.
An additional restriction is that you can ONLY participate in 1 state at the state tourney level. Example, if you are part of the Grand Forks Gladiator club (ND USA club) and live in East Grand Forks, MN, you can wrestle in Either ND USA State tourney, or MN USA State tourney, but NOT both. This is a National USA rule.
Hope that clarifies it for you. If not, just pm me. Thanks.