#' State system membership
#'
#' @description Create data based on the Gleditsch & Ward (G&W) or Correlates of
#' War (COW) state system memberships lists. This is useful as a template
#' for merging other sources of data that have conflicting sets of states.
#'
#' @details See static docs at https://andybeger.com/states and the source code
#' at https://www.github.com/andybega/states
#'
#' @references
#' Gleditsch, Kristian S. & Michael D. Ward. 1999. ``Interstate System
#' Membership: A Revised List of the Independent States since 1816.''
#' International Interactions 25: 393-413.
#'
#' Correlates of War Project. 2017. ``State System Membership List, v2016.''
#' Online, http://correlatesofwar.org
#'
#' @name states
#' @docType package
#' @aliases states-package
#'
#' @importFrom utils tail
#' @importFrom rlang .data
NULL
globalVariables(c("gwstates", "cowstates"))
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