Final answer:
The landform that runs across the United States and Canada is the Rocky Mountains. The Rocky Mountains are an immense range that stretches from New Mexico to Northern Canada.
Step-by-step explanation:
The landform that runs across the United States and Canada is the Rocky Mountains. The Rocky Mountains are an immense range that stretches from New Mexico to Northern Canada. This range was formed during the Late Paleozoic, with the main growth occurring during the Late Mesozoic and Early Cenozoic. The Rocky Mountains are marked by north-south mountain ranges in both countries, and they have had a significant influence on the geography and development of the region.
They have had a significant influence on the geography and development of the region.