Correlates of War Major Powers Data (1816-2016)Source:
These are the Correlates of War major powers data.
A data frame with 14 observations on the following 8 variables.
a numeric vector for the Correlates of War country code
the start year as a major power
the start month as a major power
the start day as a major power
the end year as a major power
the end month as a major power
the end day as a major power
a version identifier
Data are provided "as-is" with no additional re-cleaning before inclusion into this data set (beyond eliminating the state abbreviation).
Correlates of War Project. 2017. "State System Membership List, v2016." Online, https://correlatesofwar.org/data-sets/state-system-membership