Post-WWI, Germany's territorial losses, as determined by the Treaty of Versailles, primarily consisted of areas with significant non-German populations. Territories like Alsace-Lorraine went to France, and regions with Polish majorities were ceded to Poland. After WWII, the territorial changes were even more drastic. The Potsdam Agreement pushed Germany's eastern boundaries to the Oder-Neisse line, resulting in the loss of significant territories to Poland. Moreover, the Allies occupied Germany, eventually leading to its division into West and East Germany. Thus, while WWI losses were more about rectifying perceived historical wrongs, post-WWII changes aimed at both punishing Germany and curtailing its potential future aggression.

Post-WWII decolonisation led to a wave of newly independent nations in Africa. European colonial powers, weakened by the war, faced increasing resistance from nationalist movements. As colonies gained independence, new borders were drawn, often based on colonial boundaries rather than ethnic or tribal affiliations. This led to countries with a myriad of ethnic groups, setting the stage for future internal conflicts. The Scramble for Africa in the late 19th century had divided the continent without regard for local cultures or histories, and post-WWII independence did little to rectify these artificial boundaries. As a result, many African countries faced (and continue to face) territorial disputes and internal strife stemming from these imposed borders.

Yes, there were attempts, particularly during the interwar period, to revise the territorial decisions made by the Treaty of Trianon. Hungary felt the terms of the treaty were excessively punitive. The rise of fascist and authoritarian regimes in Europe in the 1930s, particularly in Germany and Italy, provided Hungary with potential allies in its quest to regain lost territories. The most significant recovery was through the First and Second Vienna Awards brokered by Nazi Germany and Fascist Italy, which allowed Hungary to regain parts of Southern Slovakia and Northern Transylvania. However, after WWII, the Paris Peace Treaties of 1947 largely reinstated the borders set by Trianon.

The annexation of Sudetenland had profound consequences for Czechoslovakia's defensive capabilities. Sudetenland was home to the country's primary defensive fortifications, so when it was ceded to Germany after the Munich Agreement in 1938, Czechoslovakia was left virtually indefensible. Without the robust defensive line of Sudetenland, the rest of the country became an easy target. Less than six months after the annexation, in March 1939, Germany occupied the remaining parts of Czechoslovakia without any significant resistance. The annexation not only deprived Czechoslovakia of its primary defence but also its rich industrial resources, crippling its economy and weakening its strategic position during WWII.

Post-WWII territorial changes significantly impacted China's geopolitics. With Japan's defeat, China regained territories like Taiwan and Manchuria. However, Manchuria became a hotspot in the Chinese Civil War as both the Nationalists and Communists vied for control, with the latter ultimately prevailing, aided in part by the existing Soviet presence. Taiwan, on the other hand, became the refuge for the Nationalist government after the Communists took over the mainland in 1949. To this day, the Taiwan Strait remains a geopolitical flashpoint, with Taiwan seeing itself as a separate entity and the People's Republic of China viewing it as a renegade province.