A Place or an Event?

Rashi and Ramban both have more than one answer to what te words "Or Kasdim" really mean. Rashi being known for trying to find the Pshat or the simple meaning, thinks that these words are referring to a place. He says the word Or is referring to the word 'Bikah'-village. In this way the words mean the Village of Kasdim. He thinks that these words can't be referring to the event of Kivshon HaAish, because if this event was so important than it should have been included in the Tanach. Ramba, on the other hand says that Avraham was not born in the land od Kasdim, because Kasdim is in the land od Cham and Avraham is a descendant of Shem. Ramban believes that the story of Kivshon HaAish is true and very important. He thinks that these words cannot be referring to a place. And if it's not a place, than they must be referring to an event.

Unfortunately, we have no evidence of weather this event actually took place. Ramban believes that it happened because of hints in the text. Rashi was not satisfied with basing his answer on a story that might not be true, so he came up with a different one.