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COVID-19 Update: We are currently closed. At this National Historic Landmark, a large antislavery delegation marched into Lecompton in 1857 to protest the pro-slavery constitutional convention meeting. The nation waited to see if the constitution written here would lead Kansas to join the Union as a slave state. Discover more about the pro-slavery and free-state forces along with the territorial history of Kansas. An 8 Wonders of Kansas finalist.