A. The stock market crash of 1929
B. World War I
C. The rise of fascism
D. The expansion of global trade
Answer: The stock market crash of 1929
What was the primary cause of the Great Depression in the 1930s?
Additional Information: The stock market crash of 1929 is considered the primary catalyst for the Great Depression, leading to widespread economic hardship.
Subjects: World History, General Knowledge