Concept:
After World War II, tensions increased between the United States and the Soviet Union.
This political and ideological conflict became known as the Cold War.
The term "Iron Curtain" became famous during this period.
Step 1: Understand the meaning of Iron Curtain.
The term:
\[
\text{"Iron Curtain"}
\]
referred to the political and ideological division between:
• Western democratic countries
• Eastern communist countries led by the Soviet Union
Step 2: Identify the leader who gave the speech.
The famous "Iron Curtain" speech was delivered by:
\[
\text{Winston Churchill}
\]
the former Prime Minister of Britain.
Step 3: Know the year and place.
Churchill delivered this speech in:
\[
1946
\]
at:
\[
\text{Fulton, Missouri, USA}
\]
In the speech, he warned about Soviet expansion in Eastern Europe.
Step 4: Eliminate incorrect options.
• Winston Churchill -- Correct
• Woodrow Wilson -- Associated with League of Nations
• Indira Gandhi -- Former Prime Minister of India
• Rudolph Hitler -- Incorrect historical reference
Step 5: Conclusion.
Hence, the correct answer is:
\[
\boxed{\text{Winston Churchill}}
\]