The League of Arab States celebrated in 2020 the diamond anniversary of its establishment, which marked the emergence of the Arab regional system and gave it the unique feature that distinguishes it: the national feature. Membership in the League of Arab States expanded from seven countries, the total of independent Arab countries in the mid-1940s, to 22 – the number of all countries in the Arab regional system. The League has developed over the years and saw many restructuring attempts, reflecting the efforts to modernize the Arab regional system itself.