origins: 290

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290 State System Membership - States State System Membership Provides states' entry and exit dates, country codes, and abbreviations. This data set contains the list of states in the international system as updated and distributed by the Correlates of War Project. These data sets identify states, their standard Correlates of War “country code” or state number (used throughout the Correlates of War project data sets), state abbreviations, and dates of membership as states and major powers in the international system. Version 2016 extends the temporal domain of the collection through December 2016. The Correlates of War project includes a state in the international system from 1816-2016 for the following criteria. Prior to 1920, the entity must have had a population greater than 500,000 and have had diplomatic missions at or above the rank of charge d’affaires with Britain and France. After 1920, the entity must be a member of the League of Nations or the United Nations, or have a population greater than 500,000 and receive diplomatic missions from two major powers. Find more information in [their codebook](https://correlatesofwar.org/wp-content/uploads/State-System-Membership-Codebook-V2016.pdf) Correlates of War Correlates of War Project. 2017. “State System Membership List, v2016.” Online, http://correlatesofwar.org Correlates of War - State System Membership (2017) COW v2016 https://correlatesofwar.org/data-sets/state-system-membership/ https://correlatesofwar.org/wp-content/uploads/states2016.csv 2023-09-22 2017-02-20 
{
    "url": "https://correlatesofwar.org/data-sets/",
    "name": "Correlates of War terms"
}

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