The answer is:
Foreign policy under the Truman doctrine stood for nation-building and interventionism during the post World War II years.
Step-by-step explanation:
The Truman Doctrine made up American Cold War policy in Europe and around the world. The commitment's rhetoric, promised that the US should aid all 'free people' being subjugated.
It also mobilized American economic power to modernize and stabilize unstable regions first without having direct military intervention.
This commitment set the stage for innumerable ventures that led to global interventions when nation-building wasn't an option.