What geographic feature defines the historical western boundary of White Crappie distribution?
Answer
The eastern slope of the Rockies.
The native geographic range of the White Crappie covers a vast area across the central and eastern United States. Specifically, the distribution extends from the northern boundary established by the Great Lakes drainage system, southward through the Mississippi River Valley down to the Gulf Coast. The text explicitly sets the western limit of this historical native range as terminating along the eastern slope of the Rocky Mountains. While stocking has expanded this range, this geographical feature marks the extent of their natural presence.

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