Western North America is more mountainous.
eastern
Eastern
EAstern :)
western
The Western US.
Western.
Western
The western side of North America is more mountainous.
Western because the Rocky Mountains
Western North America is more mountainous.
The western part of the US is generally more mountainous than the eastern part. States like Colorado, California, and Washington have significant mountain ranges, while the eastern US is characterized by lower, more rolling terrain.