The main reasons why so many people in Germany were disenchanted with the results of World War I, once the war ended were:
They had lost territories.
They had war payments to make.
Their economy was destroyed.
<h3>What is War?</h3>
This refers to the armed conflict between different people usually as a result of differences in ideology or misunderstanding which leads to loss of life and property.
Hence, we can see that after World War I, Germany was defeated and they lost territories and also were asked to make war payments which affected their economy and made many Germans unhappy.