What impact have major comic book events or crossover series, like DC's "Crisis on Infinite Earths" or Marvel's "Secret Wars," had on the continuity and development of their respective universes?

What impact have major comic book events or crossover series, like DC's "Crisis on Infinite Earths" or Marvel's "Secret Wars," had on the continuity and development of their respective universes?
Admin 2 days, 20 hours ago in Comics
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