Why was Germany upset during world war 1?

Germany was upset during World War I due to a combination of military setbacks and the harsh conditions imposed by the Treaty of Versailles. The treaty, signed in 1919, forced Germany to accept full responsibility for the war and imposed significant reparations, territorial losses, and military restrictions. This created a sense of humiliation and injustice among Germans, contributing to political instability and resentment in the years that followed. The economic hardships and national pride affected the country's psyche and ultimately paved the way for the rise of extremist movements in the 1930s.