Looking into this topic I found this statement by Abbot (now Met) Jonah wherein he directly addresses the EP's presence in USA:
". . . Its (EP's) claim of jurisdiction over the so-called "barbarian lands," or "diaspora" falls on the deaf ears of other patriarchates that have established identical institutions in the same territories, disregarding its claims to jurisdiction outside the geographic boundaries of existing churches. Beyond this, having been the first to abrogate the unity of the Church in America, Constantinople's own political
adventurism has divided the Church in Estonia, and threatens the unity of the Church in
Ukraine and other places, and hence, its communion with Moscow and other autocephalous churches. By these actions it has broken trust in itself, and sacrificed its ability to lead."
"In 1970, the Russian Orthodox Church granted autocephaly to its American mission, forming the Orthodox Church in America. While this action remains controversial to this day, it recognized the existence of a local Church in America, with the fullness of sacramental integrity and institutional self-sufficiency. In other words, the gift of autocephaly established a hierarchy with the authority to incarnate the vision and mission of the Orthodox Church in North America by its own work, and to take responsibility for the life and growth of the Church in North America while remaining accountable to the other national Churches throughout the world. Finally, there was an effort to establish church life according to canonical norms.
. . . The dilemma, however, is that with autocephaly, the presence of any other jurisdiction on American territory becomes uncanonical, and membership in the Synod of the Orthodox Church in America becomes the criterion of canonicity for all bishops in America. This, of course, has not been pushed by the oca. What is at stake, however, is the canonical order of the Church, its vision and mission."http://www.oca.org/PDF/metropolitan-jonah/MJ.Episcopacy_Primacy_Mother%20Churches.pdf