"[NATO] is an intergovernmental military alliance between 28 European countries and 2 North American countries. [...] NATO constitutes a system of collective security, whereby its independent member states agree to mutual defense in response to an attack by any external party. [...]
Since its founding, the admission of new member states has increased the alliance from the original 12 countries to 30. The most recent member state to be added to NATO was North Macedonia on 27 March 2020. NATO currently recognizes Bosnia and Herzegovina, Georgia, and Ukraine as aspiring members. An additional 20 countries participate in NATO's Partnership for Peace programme, with 15 other countries involved in institutionalized dialogue programmes. The combined military spending of all NATO members in 2020 constituted over 57% of the global nominal total. Members agreed that their aim is to reach or maintain the target defence spending of at least 2% of their GDP by 2024."
Will an additional state join NATO before 2024?
The question will resolve positively if, at any time between January 1, 2021 to January 1, 2024, any state formally joins NATO. This will be resolved based on an official statement by NATO, for example by the new state being included in the member list on NATO's official website. If a current NATO member fragments into two or more successor states and one or more of these join NATO, this will not count toward a positive resolution.