This one has 8% Slavic in 23andMe (maybe it would translate to more or less in GEDmatch):
[note that they lived for ca. 250 years in Poland & then for ca. 200 years in Ukraine/Russia]
https://i.imgur.com/EprqG1g.png
https://www.youtube.com/watch?v=nb_V-N7CETM
Probably all of them have a similar level of ca. 5-15% - on average ca. 1/10 - Slavic input.
They came to Poland before year 1540, stayed in Poland until ca. 1790, then moved to Russia/Ukraine, then to Canada in the 1900s.
23andMe nailed it by assigning that 8% of Eastern European exactly to Poland, Russia, Ukraine (all 3 are correct for the Mennonites).
Have you heard about the Seipel Line? Here is an interesting article about it:
http://faculty.ce.berkeley.edu/coby/essays/seipel.htm
^^^ One interesting quote from that article:
"(...) It is apparent from the preceding discussion that only exceptionally does the Seipel Line coincide with state boundaries; more often than not, it cuts through countries, in the sense that the meaning of nationality may be different on one side of a country than on another. But it can also cut through a people, namely, the Jewish people: the Jews’ conception of themselves – whether as a nation or as a religion (or a culturally defined ethnic group) – is largely determined by geography. It is useful to remember that what motivated F. J. Neumann to undertake his pioneering study of nationhood was the uncertain national identity of the Jews in what was then Prussian Poland (where the ethnic Poles were unwavering in their Polishness, despite Bismarck’s Germanization campaign), in contrast to the Jews of Germany proper, who saw themselves – largely as a result of the Enlightenment-inspired teachings of Moses Mendelssohn – as Germans. (...)"
^^^
Funny that Jews [those who lived in the German Empire, at least] wanted so badly to be accepted as Germans, and yet Germans rejected them. On the other hand, they tried so hard to Germanize the Poles, who did not want (as we wanted to have our own empire, like we did before 1772).
But what to expect from an empire, which even had an officially approved political party called Antii-Semites [Antisemiten]? :blink:
If you check for example the results of Reichstag elections in 1907, the Anti-Semites Party won in much of Central Germany.

