The “national” is part of the overall problem.
That churches were naturally "national’ at one time made sense and was inevitable. That day has passed.
Whatever a person thinks of him one way or another (and you can debate his various actions) one thing that was good about Archbishop John Ireland’s approach to that in the US was that he strongly opposed ethnic identity withing the Catholic Church in the US. He didn’t want “Irish” parishes or “German” parishes. That same belief, of course, is what lead to his terrible mistake with the Eastern Rite in the US. Anyhow, within the Catholic Church, that did set the groundwork to transition from ethnic Catholicism back, and it is back, to universality.
The Orthodox are going to have to do the same thing, and in the US they are trying. Stuff like this, however, causes all sorts of problems for Orthodox believers who are in the US, often intermarried with those of other backgrounds, as they try to remain faithful. The Creed says we are all to believe in one “Catholic”, i.e., universal, church. Creating these sorts of divisions in 2018 sure doesn’t help that at all.