Which statement best identifies the central idea of the speech?
a. winston churchill believes it’s important to be for what the good and the bad can teach us during war.
b. the united kingdom’s persistence during the war, despite difficult times, show that it is important not to surrender when things look bad.
c. winston churchill advocates for the international collaboration of nations across the world.
d. by assuming the very worst, winston churchill believes we can be prepared for anything and everything.

The Winston Churchill talks about the Soviet Union's policies in Europe in his speech by saying: “From Stettin in the Baltic to Trieste in the Adriatic, an iron curtain has descended across the continent.”

Explanation: The statement os Churchill was seen as a way to announce the beginning of the cold War. Something to highlight is that Churchill gave this speech in Fulton, Missouri after he had been defeated for re-election as a prime minister in 1945.

Which was the purpose of his speech?

The main purpose was to achieve a closer "relationship" between the United States and Great Britain to organize and control the postwar world.

Hope this helps.

b.   jim crow laws were enacted in northern states.