The United States decided to help South Korea and South Vietnam during major conflicts. Which statement describes the reason for this action?
A need to create more equal trade

A need to keep a military base in Asia

A need to keep the Soviet Union out of Asia

A need to expand American territory

A need to keep the Soviet Union out of Asia .

Explanation:

The rationale for US military involvement in both Korea and Vietnam was practically the same: to stop communist expansion in Asia and avoid the fall of friendly countries into the hands of communist movements, an outcome that would have supposed an advantage for the Soviet Union in the geopolitical chess game of the Cold War bipolar order.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

i think it is the first one hope this