Why was the peace process at the war's end so lengthy? what complications did wilson encounter in his attempts to promote the process and realize his postwar vision?

The peace process was complicated because France and Britain could not agree with the USA on the way to treat Germany. In addition, the wave of nationalism and communism by the bolsheviks complicated the issue further.

Wilson vision of a league of nation was also not successful at home as the congress refused to ratify American membership. the league of nation would have been very successful with the American participation. The great powers could also not agree on key issues such as disarmament.