What would the north and south be like if the south had seceded?

Would we have avoided the civil war if we had just let the south go?

Would each state in the south have been its’ own country basically? Or, would the southern states still have been united?

Would the south have maintained the same constitution as the North, just interpret it differently?

Would the north basically be as the US is today?

I’m interested in any thoughts you have regarding the topic on how the north and the south might be different today, better or worse.