Read the passage carefully.
In 1932, voters elected Franklin D. Roosevelt president in a landslide victory. "FDR," as everyone called him, was a wealthy New Yorker who had been stricken with polio a decade earlier. Paralyzed from the waist down, his legs useless, FDR knew about suffering firsthand. Through suffering, he grew as a person, developing deep sympathy for the downtrodden. That, in turn, shaped his ideas about government. Roosevelt believed that government was the people's servant, not its master. In times of trouble, he insisted, the chief duty of the federal government was to help those who could no longer help themselves.
–Years of Dust: The Story of the Dust Bowl,
Albert Marrin
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What is the organizational structure of the passage?