How did Winston Churchill's "Iron Curtain" speech impact the Truman Doctrine? The speech convinced Americans that the USSR was an enemy, rather than an ally, which led to the creation of the Truman Doctrine. The speech made Americans aware that the USSR had nuclear weapons, which led to the end of the Truman Doctrine. The speech showed that Great Britain was not strong enough to oppose the USSR, which led to the rejection of the Truman Doctrine. The speech revealed that Eastern European countries were no threat to their neighbors, which led to the creation of the Truman Doctrine.

The correct answer is the first option: the speech convinced Americans that the USSR was an enemy, rather than an ally, which led to the creation of the Truman Doctrine.

Winston Churchill's speech (gave in March 1946 in Missouri) produced a strong impact on Americans and president Truman. He referred to the USSR as an "iron curtain" to express how it was a big problem for all the rest of the countries because it had many military and economic allies, which made the USSR powerful as well as dangerous.

As a result, the Truman Doctrine was created by President Truman to show that the US wouldn't be an ally of the USSR. Instead, it would provide military, economic and political assistance to democratic nations who were in danger of any form of authoritarianism.

The correct answer is: "The speech convinced Americans that the USSR was an enemy, rather than an ally, which led to the creation of the Truman Doctrine".

The speech pronounced by the UK president Winston Churchill tried to condemn the URSS policies and to call to action to the other former Ally Countries in order to combat its expansion.

It gave rise to the Truman Doctrine, an US foreign policy approved in 1947 that was designed with the purpouse of limiting the expansion of URSS, during the Cold War era. It tried to spoil the Soviet objectives without direct military interventions.