​The Alliance Treaty Obligations and Provisions (ATOP) project provides data regarding the content of military alliance agreements signed by all countries of the world between 1815 and 2018. We gratefully acknowledge the support of the National Science Foundation (grant SES-0095983). 

Please visit the Data page to download CSV and STATA versions of the ATOP 5.1 dataset.  The Additional Data page contains CSV and STATA versions of datasets derived from ATOP variables.

The Documentation section includes the ATOP Codebook, access to each alliance's codesheet with citations to the treaties and details of coding decisions, and other documents. Previous versions of the dataset as well as the lists of changes between each version are available for download on the Dataset History page.