These are the Correlates of War state system membership data.
A data frame with 243 observations on the following 10 variables.
a character vector for the state abbreviation
a numeric vector for the Correlates of War country code
a character vector for the state name
the start year in the system
the start month in the system
the start day in the system
the end year in the system
the end month in the system
the end day in the system
a version identifier
Data are provided "as-is" with no additional re-cleaning before inclusion into this data set.
Correlates of War Project. 2017. "State System Membership List, v2016." Online, https://correlatesofwar.org/data-sets/state-system-membership
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