These are Zeev Maoz' data for what states are regional or global powers at a given point time. They are extensions of the Correlates of War major power data, which only codes "major" power without consideration of regional or global distinctions. Think of Austria-Hungary as intuitive of the issue here. Austria-Hungary is a major power in the Correlates of War data, but there is good reason to treat Austria-Hungary as a major power only within Europe. That is what Zeev Maoz tries to do here.
Format
A data frame with 20 observations on the following 5 variables.
ccodea numeric vector for the Correlates of War country code
regstdatethe start date for regional power status
regenddatethe end date for regional power status
globstdatethe start date for global power status
globenddatethe end date for global power status