Historian A: John Lewis Gaddis – Political/Strategic Perspective "Gaddis argues that the Truman Doctrine was primarily a strategic move by the United States to contain Soviet expansion. It marked a decisive shift in US foreign policy from isolationism to interventionism, aiming to prevent the spread of communism through military and economic support. Gaddis emphasizes the importance of the Cold War context, viewing the Doctrine as a calculated response to the Soviet threat in Greece and Turkey, which set the tone for American foreign policy for decades. This interpretation highlights political and strategic motivations behind Truman’s decisions."

Historian B: Melvyn Leffler – Economic and Ideological Perspective "Leffler contends that the Truman Doctrine was driven by economic interests and ideological beliefs. He suggests that the US aimed to protect its economic markets and prevent the spread of Soviet influence that threatened Western capitalism. Leffler emphasizes that Truman was motivated by the desire to maintain American economic dominance and promote democracy, viewing the Doctrine as an extension of a broader ideological struggle against communism. This perspective focuses on economic motives and the ideological context of the early Cold War."