Respuesta :
The right answer is the first option: Churchill's famous speech convinced many Americans that the USSR was an enemy rather than an ally, which led to the creation of the Truman Doctrine.
The Truman Doctrine itself was an American foreign policy made to counter the USSR's geopolitcal sphere of influence to spread. Churchill used the term "Iron Curtain" to refer to the threat the Soviet Union presented to the rest of Europe.
The way that Winston Churchill's "Iron Curtain" speech impacted the Truman Doctrine was A. Churchill’s famous speech convinced many Americans that the USSR was an enemy rather than an ally, which led to the creation of the Truman Doctrine.
What was the Truman Doctrine?
The Truman Doctrine was a creation of President Harry S. Truman to enable the United States to provide political, military, and economic support to threatened democratic nations. For example, President Truman requested Congress to support the Greek Government against the Communists.
Thus, the “Iron Curtain” speech by Churchill, which was a metaphor for the Soviet Union's blatant expansionism and the spread of Communion, created the awareness that the USSR was an American enemy rather than an ally.
Learn more about Winston Churchill’s “Iron Curtain” speech and the Truman Doctrine at https://brainly.com/question/497450