Final answer:
The United States and Canada control vast territories due to their geographical size, abundant natural resources, and access to coastlines.
Step-by-step explanation:
A feature of the United States and Canada that allows them to control vast territories is their geographical size and resources. The United States and Canada both have large land areas with abundant natural resources, such as minerals, forests, and fresh water. This enables them to control and utilize these resources for economic and strategic purposes.
Additionally, the two countries have access to significant coastlines, which allows for trade, transportation, and defense.