note: An Eastern Catholic or Orthodox can correct any of this is I am wrong, but this is my understanding.
@HomeschoolDad, You have a misconception that the Orthodox divide themselves based on ethnicity. Historically, Churches were divided based on geography and typically national boundaries. Of course, 1500 years ago, that would be pretty much the same as ethnicity. But, ideally, there would never be any Dioceses overlapping between rites. And the patriarchies and/or rites were then groupings of these dioceses. If an person immigrated across rites, for example a Greek moved to the west, then he would fall under that Latin Bishop. If there was a whole group of people who moved into a certain area, then the local Bishop could start a extra-territorial parish under their rite, but it would be part of the local bishop’s jurisdiction.
All of this plays into your other thread as to why not have a “English rite” church. The Anglicans are spread all over the world. The Church does not would not desire a whole parallel set of diocese and Bishops covering the same areas.