First of all, nationalism is not national sovereignty.

The former is a social construct which an individual embraces while the latter is a principal of law which a group embraces.

The former is hardly useful, but the latter is vital to all existing nations. No nation is going to willingly give up its right to self governance.

> I'm in favor of putting limits on concentrations of sovereignty.

So, essentially, you wish to live in a world without borders where one or more unions govern many places regardless of geographical separation?

Because that worked out so well in the past...