Answer:
George Kennan
Step-by-step explanation:
In 1947, diplomat George Kennan wrote an article that touched on Soviet expansion plans as well as guiding postwar US policy for decades. In a text in which he only signed "X," he proposed that the United States stop the worldwide spread of communism through ideology and politics instead of war. The proposed policy was known as "containment," and Kennan became a Pulitzer Prize-winning historian.