The "United States" category for books encompasses literature that is set in or explores the history, culture, and society of the United States. This includes works of fiction, non-fiction, and memoirs that focus on American life, politics, and social issues. Books in this category may cover a wide range of topics, from the founding of the nation to contemporary issues such as race, gender, and immigration. The United States category is a broad and diverse genre that reflects the rich and complex history of the country.

The "Spy" category of books typically involves stories of espionage, covert operations, and intelligence gathering. These books often feature protagonists who are highly skilled and trained in the art of espionage, and who work for various government agencies or private organizations. The plots are often complex and involve intricate schemes and high-stakes missions, with the threat of danger and betrayal always looming. Spy books can be set in various time periods and locations, and can range from action-packed thrillers to more cerebral and nuanced stories of espionage.

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