Final answer:
The Grand Ole Opry was the first country and western radio show to be broadcast on a national radio network.
Step-by-step explanation:
The first country and western radio show to be broadcast on a national radio network was the Grand Ole Opry. It started as a weekly program in 1925 and is still on the air today. The show is known for launching the careers of many country music stars and has been instrumental in popularizing the genre.
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