Neville > I don�t think this post is about the times with Chassidim controversially don�t say tachanun, but rather when Litvaks controversially DO
How is the fact that someone in Baghdad did not say tachanun affected what happened in Vilna? Chassidim changed minhagim of their communities, not litvakim. The only controversy about litvakim is their extraordinary effect on Ashkenaz in general, given that this was a small country.
By the way, note that parsha Noach mentions Ashkenaz, but not Sepharad, Lubavich or Uman.