This presentation discusses a project to build historical geographical datasets using DBpedia. It describes a dataset on United States political violence from 1780-2010 that records over 1500 events. Tools were created to improve the quality of the geographical data in the dataset, including a table-based and map-based tool for semiautomated matching of locations. The presentation also discusses improving data browsing with an interface that allows users to visualize subsets of the spatial data.