Solution:(a) Treaty of Westphalia (1648): This series of treaties marked the end of the Thirty Years’ War in the Holy Roman Empire and the Eighty Years’ War between Spain and the Dutch Republic.(b) League of Nations (1920): The League of Nations was established after World War I as an international organization aimed at promoting peace and cooperation among nations. It was the first attempt at creating a global organization to maintain international order.
(c) World War-2 (1939-1945): One of the most devastating conflicts in human history, World War II involved many nations around the world.
(e) Liberation of Central Asian Republics (1991-1992): This refers to the period following the dissolution of the Soviet Union, during which the Central Asian republics (such as Kazakhstan, Uzbekistan, Turkmenistan, Kyrgyzstan, and Tajikistan) gained independence.
The process began in 1991 with the collapse of the Soviet Union and continued into 1992 as these newly independent countries established their own governments and international identities.
(d) Bifurcation of Sudan (2011): This event refers to the peaceful secession of South Sudan from Sudan in 2011.