The vast majority of Russian Orthodox Churches in the Pennsylvania were actually not
comprised of Russians at all, but Carpatho-Rusyns. Some were entirely Lemko parishes, some entirely Subcarpathian and many a mixture of both Rusyn groups. In this instance, many of these people have adopted a "Russian" identity.
"While these people may call themselves Russians, they really don't know what that is", "They still live Rusyn culture, serving Rusyn foods, singing Rusyn songs, preserving Rusyn customs, but calling it all "Russian". Who are the Rusyns http://www.c-rs.org/whoarerusyns.htm
In addition, in northeastern Pennsylvania's hard coal region, for example, the number of Ukrainian Catholic (and Orthodox) Churches are less than 10% of Ukrainian origin. Faced with the strong wave of Ukrainization in 1920 the Rusyn parishes became Ukrainian and lost their Rusyn identity. This happen also on the Russian Orthodox parishes losing the Rusyn identity and began think of themselves as Russian which they are not.