Step 1: Understanding the term "War Bowl."
- "War Bowl" is a term used to describe Pittsburgh due to its significant industrial contributions, especially during World War II. Pittsburgh was a major hub for steel production, vital for war machinery and infrastructure.
- Other cities listed, like Chicago and Cleveland, have their own industrial history but are not specifically referred to as the "War Bowl."
Step 2: Conclusion.
Pittsburgh's historical role in war-related industries earned it the nickname "War Bowl."
\[
\boxed{\text{Thus, the correct answer is Pittsburgh.}}
\]