State System Membership (v2016) now available.
The State System Membership data (v2016) is now available. The data are updated through 2016.
- News
- Will Moore's Passing May 03, 2017
- State System Membership (v2016) now available. Feb 27, 2017
- Trade (v4.0) now available. Feb 20, 2017
- Colonial/Dependency Contiguity v3.1 available Feb 17, 2017
- Direct Contiguity v3.2 available Feb 13, 2017