The yeshivas in europe were all not zionist, besides for the outlier yeshivas that weren’t really part of the mainstream yeshiva world (such as r’ reines’ yeshiva in Lida). Do some historical research. The reason for this is simple. In yeshivas, the students listened to the far far majority of gedolim of the time, since that is what the torah says to do (see sefer hachinuch mitzva 495 and 496, drashas haran 12, shiltos parshas mishpatim 58, ramban on parshas shoftim on pasuk of yamin u’smoel, the Rambam in his hakdama to mishna torah, Raavad quoted by the Rosh in sanhedrin and brought down in the Tur CM siman 25, ???? ???? ????). The far far majority of gedolim were against zionism from the onset. Many of these gedolim were either teaching in or very connected to a yeshiva or multiple yeshivas. A very very non inclusive list would include: The Chofetz Chaim (who was the head of Radin), R’ Chaim Brisker (head of volozhin), R’ Chaim Ozer (the Ramlis yeshiva was under him), The Rugatchover, R’ Elchonon (boronovitch), R’ Baruch Ber (kamenitz), R’ Shamshon R. Hirsch (head of the berlin yeshiva), R’ Yehoshua leib Diskin, The Fifth Lubavitcher Rebbe, R’ Isaac Sher (head of Slabodka), R’ Yosef Chaim Zonnenfeld, R’ Zelig Bengis, R’ Shlomo Breuer, R’ Yosef Leib Bloch (the head of the telz yeshiva), the chazon ish, the brisker rov, R’ Ahron Kotler (head of Kletzk), R’ Reuven Grozovsky, R’ Shlomo Heiman (Ramlis), R’ Leizer Yudel Finkel (mir), The Ponovitcher Rov (head of Ponovitch), The Satmar Rov, The Klausenberger Rov. There are many many more. Almost all of them. Almost all of the above rabbis’ positions are documented, many of which you can easily find. Some can be found on the website www dot torahjews dot org under the section resources and rabbinic quotes. (not that I endorse the website).
I myself am not such a kanoi or anti zionist, but the facts are that most most most of our gedolim and the yeshivas in europe were not zionist.