western North America
The western side of North America is more mountainous.
Western North America is more mountainous.
western
Western.
Western North America is more mountainous.
Western North America is the most mountainous part of North America.
The western part of North America since it is where the Rocky Mountains are.
Although both sides are both mountainous, the western side of the US has a much more mountainous landscape. But it is mostly the Northern Butte side.
EAstern :)
Western North America is more mountainous.
Western because the Rocky Mountains
The more mountainous is the western side of north America