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Probably either the Dominion or the Klingons

It depends on what you mean be "strongest". In terms of physical strength or martial prowess I would agree that it is a tie between Klingons and Jem'Hadar. In terms of weaponry the cardassian disruptors are thought by many to be the best in the quadrant and Cardassians have been describe a "worthy enemies" by Klingons a statement they do not make often. As far as technological superiority the Borg are the clear victor.

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