When I recently looked at the 1920 Census for my maternal grandparents, I had to search Walnut Street in CHELSEA, MA. Half of Chelsea -- at least that particular area -- was >from Kovna. I remember thinking, What happened in Kovna that the whole damn town left. It was really quite remarkable. Neighbor after neighbor.
That's interesting. My grandmother was >from Kovno, too. She spoke of a pogrom during which she and one of her sisters hid under some hay for 3 days. I don't know if that event in and of itself precipitated her emigration to Chicago.