Right I see. In case you happen to be interested, Hannah Arendt suggested a system of federated councils which I find interesting. I’m not an expert on it, but there are some essays about it like this.

Fundamentally there are two kinds of nationalism: civic and romantic. Civic nationalism is about people adhering to a society's set of laws and values. Romantic nationalism, also known as blood and soil nationalism, incorporates those concepts of birthright and bloodlines as important to one's status in a nation.

The United States was a major pioneer and proponent of the civic kind, defying the traditional romantic nationalism that grew out of Europe. Despite our historical misgivings it's an important difference.