Members of the international state system since 1816 (Correlates of War)
Every period in which a country counted as an independent member of the international state system since 1816, by the Correlates of War Project's criteria, with the dates it entered and left and the years it was a major power. One row per period of membership.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| id | Row | string | COW abbreviation and entry year, e.g. POL-1918. |
| cow_code | COW code | integer | Correlates of War numeric country code (ccode). |
| cow_abbr | COW abbr. | string | Correlates of War three-letter abbreviation (not an ISO code). |
| name | State | string | State name as given by the Correlates of War Project. |
| entered | Entered system | date | Date the state entered the system (1816-01-01 = already a member at the start). |
| left | Left system | date | Date the state left the system; blank when still a member. |
| still_member | Still a member | boolean | True when the period runs to the end of the latest release. |
| years_in_system | Years in system | number · years | Length of the period in years (to the end of the release for current members). |
| major_power | Major power | boolean | True if the state was a major power at any time during this period. |
| major_power_years | Major power periods | string | Year ranges in which the state was a major power during this period. |
| data_version | Version | integer | Correlates of War release the row comes from. |
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