I want to know the answer to the following question:
What made Tennessee politics more competitive again in the middle of the 20th century?
All the background I'm provided with is that "In the 20th century, Tennessee transitioned from an agrarian economy to a more diversified economy, aided by massive federal investment in the Tennessee Valley Authority and, in the early 1940s, the city of Oak Ridge.". Is that enough to answer the question?
Answer: no