"The story of Passover is the origin story of Klal Yisrael."

"What is the origination of the various different havaras in klal yisroel? i.e. Litvish, Chasidish, Sefardish, Teimani, etc. When and where did the so-called Litvish havara split from the so-called Chasidish havara? What other havaras exist?" (source)