For the essay titled "The Great Depression in Europe, 1929–1939," the two subtopics that are likely to appear are:
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economic causes: This subtopic is essential to understanding the situation as it addresses the factors that led to the Great Depression in Europe.
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impact on unemployment: This subtopic is also relevant as the Great Depression had a significant impact on unemployment rates across Europe.
The other options (music of the Harlem Renaissance, history of global recessions, and early history of Franklin Roosevelt) are not specifically focused on the European context of the Great Depression during the specified time period.