American involvement refers to the participation of the United States in a particular event or conflict. In this context, it specifically refers to the United States joining and becoming an active participant in World War I.
Related terms
Neutrality: Neutrality refers to a policy where a country chooses not to take sides or get involved in conflicts between other nations.
Isolationism: Isolationism is a policy where a country avoids getting involved in international affairs and focuses on its own internal matters.
Interventionism: Interventionism is a policy where a country actively involves itself in foreign affairs, including conflicts, for various reasons such as national security or promoting its interests abroad.