The global challenge that Sir Winston Churchill addresses in his Iron Curtain speech is the need for the US and Britain to promote peace and prevent Soviet war.
What were Churchill's achievements?
The Prime Minister of the United Kingdom in the Second World War, instilled nationalist ideals and the confidence of the population through his speeches, shaping the strategy of the allies in the war and achieving the country's victory.
Therefore, Churchill's greatest highlights were his fight against the expansionist threat of the Soviet Union during and after the war.
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