How are the Sierra Madre mountains related to the Rocky Mountains?

The Sierra Madre mountain system and the Rocky Mountains are related through their shared geological history. Specifically, the elevation, folding, and faulting processes that shaped the Mexican Plateau and the surrounding Sierra Madre ranges occurred contemporaneously with the uplift of the Rocky Mountains.1

Both systems are part of the broader tectonic development of North America's Western Cordillera, which formed as the continent drifted westward over the Pacific Ocean floor, leading to the accretion of terranes and volcanic activity along the continental margin. While the Sierra Madre Occidental and Oriental were formed through complex periods of deformation, igneous intrusion, and Cenozoic volcanic activity, their structural evolution is tied to the same major orogenic events that created the mountain chains of the western United States.21