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C O N S T I T U T I O N H A L L IN TOPEKATERRITORIAL KANSAS ANTISLAVERY CAPITOL Toward A More Perfect Union Discover crucial moments that shaped the course of American history at Constitution Hall in Topeka the Free State Kansas Territorial Capitol. Here in 1855 delegates gathered for the Topeka Constitutional Convention and boldly prohibited slavery in Kansas. This groundbreaking decision in the proposed Topeka Constitution39s Bill of Rights was pivotal in halting the westward expansion of slavery. However national proslavery forces prevented Congressional passage of the Topeka Constitution and compelled the U.