Most countries have minimum citizenship requirements for board members, to avoid scams where a company does something bad and there are no board members within their jurisdiction to be held to account.
The U.S. is no different than most other countries in that regard, and CCOR has to be incorporated somewhere. The US has the strongest laws protecting cooperative members, and consequently hosts more cooperatives than any other country, so it’s a good place to get started, and a majority of the founding board members thus had to be US citizens. That can be changed through election if we succeed.