רבש”ה also pointed out, that not only those cultural hints mentioned earlier (such as our calling ourselves Ashkenazim, sharing the Yiddish language, and teitching a posuk of chumash) are proof of our common descent, it’s also the expressions which the פוסקים, like the רמ”א, the לבוש, the ב”ח, the ט”ז…….. down to Reb Moshe Feinstein, use, saying that we are מבני בניהם של אשכנז (descended from Jews of Ashkenaz), therefore we are bound to the poskim of Ashkenaz. That’s why we do not follow the בית יוסף, who has the Sepharadi heritage, which is parallel to Ashkenaz. We follow the Ashkenaz poskim because we are descended from them.
Note that none of the poskim mentioned above resided in Germany (אשכנז), at least as far as I know. They were from Central and Eastern Europe. And yet they still considered themselves the continuation of the Jewry of אשכנז.
Tags: Returning to roots