Final answer:
German, Italian, and Japanese objections to the treaties ending WWI centered around their respective territorial and economic grievances, with Germany and Italy feeling punished, while Japan felt denied equal treatment and full colonial entitlements.
Step-by-step explanation:
The German, Italian, and Japanese objections to the treaties ending World War I were rooted in dissatisfaction with the territorial and economic terms imposed upon them. Germany was burdened by heavy reparations and territorial losses, and the infamous 'war guilt clause' inflamed German nationalist sentiments. Italy felt betrayed as it did not receive the territories promised for joining the Allied cause, leading to anti-American sentiment and a sense of being short-changed. Lastly, Japan was discontented with the rejection of its racial equality proposal and being denied all of the German colonial holdings they expected.
While Germany and Italy were more concerned with what they had lost or had not received, the Japanese grievances were somewhat different, focusing on matters of racial equality and colonial expansion. All three nations would later seek redress in ways that contributed to the conditions leading up to World War II. This dissatisfaction fueled the rise of totalitarian regimes, exemplified by the emergence of Fascism under Mussolini in Italy and the Nazi Party under Hitler in Germany, as well as the expansionist policies of Japan in Asia.