Together with other researchers, I have assembled two datasets that are publicly available. Both are described in more detail and available of download on the linked pages.
1. Measure of International Authority (MIA) measures the authority exercised by 76 international organizations through delegation and pooling as well as their policy scope (1950-2019).
2. Legitimation Strategies of Regional Organizations (LegRO) measures the strategies used by 28 regional organizations to legitimize their authority (1980-2020).