My understanding of such things is that it is as was said earlier, the Poles (principally Polish-Jewish people)came over in the later 19th C. when the earlier immigrants had forgotten how much it sucked to be a newcomer to a strange land. The previous immigrants wanted to feel better than these huddled masses and made them the butt of their jokes. I am also told (and beg correction if wrong) that “Polak” jokes originated about the same time as the slur “Kike”; supposedly in the German and German-Jewish immigrant communities. The story is that these folks looked down on the poor newly arrived Polish Jews and their “peculiar” last names and began refered to them as “Kikes” (maybe from “Ki’s”?), much like so many people of Polish ancestry get the nickname “Ski” today. I don’t mean to offend anyone, that’s just the story I heard. Prejudice is seldom pretty.
Incidentally, I think the earlier posting about the Polish-American aviator is referring to Gaberseki (whos name I have most likely misspelled). He flew P-47’s for the USAAF in WWII.
The Polish Air Force in September 1939 was only a little worse off in terms of equipment quality than the US Army Air Force (then “-Corps” vice “-Force”). The top of the line Polish fighter aircraft at the time was the PZL-11c, which was a monoplane, although with fixed (vice retractable) landing gear and an open cockpit. This was when the US Navy’s principal fighter was the Grumman F3F biplane (oddly, with retractable landing gear and a closed cockpit). The Polish Army was much bigger than the US Army was at the time. So were the Armies and Air Arms most of the other nations that the Nazis subsequently rolled over so quickly.