An interesting part about the split is that it is the first time in Blockchain history that not only transaction data have been transferred but also content,

I'm not super intimate with other forks. So when bitcoin cash split they did not carry along the blockchain history. Or ethereum classic? All of those transactions gone? They started with zero content, zero history, 0kb in the block chain? I had in mind that those chains in fact consider themselves the original chain even if they changed their name.