In response to the query below, I received 34 responses (some of
them were posted to JewishGen also). In case others are curious
about the results: The consensus was that immigrants to the
USA did in fact return to Europe fairly often. The information
helps me to understand the activities of my ENGLANDER-STRAUSBERG
branch after they settled in Newark, New Jersey in 1893.

I have learned, >from what seems like a reliable source, that
someone on my family tree went "back to Europe" in about 1905.
(He was >from Czestochowa, Poland.)

This strikes me as very unlikely. Or is it??

Does anyone have confirmed cases of family members going back
to Poland??

Daniel Kazez <dkazez@mail.wittenberg.edu>
ALHADEFF, Jacob & Rafael: Cuba, 1920.
KAZEZ, Nisim: Leipzig-1952. LEBOY, "John Doe": Florida, 1996.
FRESCO, Moris, Juliette, Colette: Paris, 1948.
DEVIDAS, Sarah, Pauline, & Albert: Argentina, 1932.
ENGLANDER, Solomon, Mary, Joseph, & Samuel.
http://jewishcuba.org/famties/