Explanation: if your talking about the treaty of versailles, they were very very hard on germany. they wanted them to pay for all the damage (which was more then the country could ever afford). they also made it to were they were not allowed to have military power. This caused the german people to suffer greatly. In return they became angry.
C- colonization era Constitution era obviously isnt it Reform era was known as the progressive era the early republic era had to with transfer of govt thus leaving colonization era as the last option