Conversation so far:
What was the Chautauqua circuit?
Bryan was the most popular speaker on the Chautauqua circuit, delivering thousands of paid speeches on current events.
What are some examples of the topics that he spoke about?
He mostly spoke about Christianity, but covered a wide variety of topics.
What was his topic on Christianity about?
stressed that Christian theology was the solid foundation of morality.

Question: What is another topic that he spoke on?
Self-contained rewrite: Besides Christianity, what is another topic William Jennings Bryan spoke on?