Current research and investigation suggest that the entire North American cougar population is but one subspecies. Therefore, the "Eastern Cougar" were just North American Cougars living along the East coast.
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Thanks for your comment, @kouba01!
There have been a lot of debate about the taxonomy of the cougars, and there are arguments for both your view of the matter, as well as scientists who prefer to think of them as two separate subspecies.
Best regards from @valth