During the Cenozoic era,the eastern and western margins of North America experienced similar geologic events.

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During the Cenozoic era,the eastern and western margins of North America experienced different geologic events. The western margin experienced uplift and tectonic activity due to the subduction of the Pacific Plate, leading to the formation of the Rocky Mountains. The eastern margin, on the other hand, experienced erosion and sedimentation, leading to the formation of the Appalachian Mountains.

During the Cenozoic Era,the Eastern and Western Margins of North