What is the fine-grained topic of the following text: Even though the series is set in the distant future, Fallout’s snarky humor and atompunk, retrofuturist aesthetic draws heavily upon post-World War II America—in particular its cheery promises of better living through technology marred by a persistent Cold War threat of nuclear annihilation. Only return the topic.
The influence of post-World War II America and Cold War themes on the aesthetic and humor of the Fallout series.