Hi Lori, I took a look at your Grandfather's profile and then did a quick search for the history of Łódź, his birthplace. As far as I can see, when Edmund was born there in 1891, Łódź was part of the Russian Empire, not Prussia. (His birth record looks like Russian, language of the government in power at the time, not German or Polish.). Łódź was still part of the Russian Empire after Edmund migrated and married Rosina in Pennsylvania in 1916. So although he lived in a place that is in Poland today, he did not live in Poland. From the history of
Łódź and the information you've provided, it would seem your Grandfather's roots most likely are German, not Polish.
You may find the Wikipedia article about Łódź to be helpful, as well as the Łódź timeline.
ETA: Because my grandfather was also born in 1891, in a different part of the Russian Empire, Edmund's story has been particularly interesting to me. I went back today and took a further look at Edmund's profile page. It is interesting to note that on his draft registration for WWI he is reported as born in State: (Poland), Nation: Russia, and as a Russian citizen. During the same time frame, on his 1916 marriage registration, he is shown as born as Poland, with parents living in Poland. On his WWII draft registration, he is shown again as born in Russia.