Question

where did america become imperially active during the early 1900s?
across north america
beyond its continent
in space

Explanation:

In the early 1900s, American imperialism was focused on regions outside of North America, such as the Philippines, Cuba, and other areas. "Across North America" is incorrect as the US was already established there. "In space" is irrelevant as space exploration was not a thing then. So the correct option is the one about being beyond its continent.

Answer:

B. beyond its continent