But it's when we get to JLA/Avengers that problems crop up. This crossover is of the first kind - inter-dimensional travel - and is canon, as it had repurcussions in mainstream DC, but it posits that any merging of two distinct universes results in widespread cataclysm and destruction....none of which was evident during the earlier mergers which must have occurred. So, from an in-story perspective, how to account for this?
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