Conversation so far:
Can you tell me one of Robert Dale Owen's bigger political activities?
Robert Dale Owen represented Indiana in the U.S. House of Representatives (1843–47).
What year did Robert Dale Owen start working in the House of Representatives?
1843
When did Robert Owen's time in the House of Representatives come to an end?
1847
What else did Robert Owen do in the political field?
Robert Dale Owen is also noted for a series of open letters he wrote in 1862 that favored the abolition of slavery and supported general emancipation.

Question: what were these letters about
Self-contained rewrite: What were Robert Owen's open letters about?