Three-Toed Sloth

"What Do We Want?" "Quantitative Data!" " When Do We Want It?" "Soon Would Be Good!"

Someone, somewhere, has assembled a fairly reliable, comprehensive and machine-readable data set on contentious politics in the United States over the 20th century, or some large part of it. A detailed event catalog would be ideal, but I would settle for an annual index-number time series if need be. Who has done there, where are the results, and how can I get them? Leads will be rewarded with acknowledgments and/or citations, as appropriate.

In the meanwhile:

Commit a Social Science; Writing for Antiquity; The Beloved Republic