Replication Data for: Density and Decline in the Founding of International NGOs in the United States

It is now commonplace for scholars to note that the number of international nongovernmental organizations (INGOs) has exploded. But, in recent years, the growth rate of INGOs globally and in the United States has stagnated. We argue this stagnation can best be explained by changes in the environment in which INGOs work. Specifically, the now dense population environment discourages new INGOs from being founded, while also encouraging competition. Analysis of a new, comprehensive dataset on American INGOs between 1992 and 2012 supports the argument, as do case studies of trends within the environmental conservation and democracy assistance sectors. The analysis suggests that debates about INGO cooperation and competition overlook a key environmental factor that varies across and within populations of organizations: density. We draw out the implications of this approach for contemporary global governance.