I think it becomes difficult because they all wanted to have more advantages than anyone else, that became too much for the country that they defeated. The Potsdam Conference became difficult because they have problems on the things that they should do with Germany that they want to completely disarm the country.
Muhammad's teachings were popular with poorer people because he predicted all people were equal and the rich should share their wealth with the poor.
Duty or Tariff are other names for taxes on imports
The French Revolution had destroyed a French monarchy based on the divine right of kings. So yes it did. Hope I helped. :)
