The 5.1 version of 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.
The authors hope the project will be useful in understanding (1) the conditions under which leaders sign formal alliance agreements and why they do so; (2) why leaders design alliances with varying obligations and provisions; (3) the effects of alliances on subsequent behavior and the role of design features in influencing these effects; and (4) the success of alliances in eliciting compliance, and the role of design features in influencing this success.