I have to write a diary entry from Woodrow Wilson's perspective about the Treaty of Versailles.
1 entry is about his perspective, reason and actions during the Paris Peace Conference and entry 2 is about his perspective, reason and action during the signing.
In writing a diary entry from President Wilson's point of view, it's important to "get inside his head."
The best way to write a diary entry is to personalize it, and the best approach to take in terms of what to write about would be Wilson's reactions to what is unfolding in front of him.
President Wilson approached the Paris Peace Conference with a sense of hope. He was optimistic that the conference would offer a chance to end war as a means to resolve conflict. Wilson recognized that World War I was costly in terms of lives, money, and continental legacy. One of the actions that reflected such beliefs was Wilson's desire to enact his "Fourteen Points," of which a world organization called the League of Nations served as its cornerstone. Wilson believed that the League of Nations was essential to keeping the peace in Europe so that the horrific nature of World War I would not be repeated again. Being able to capture this feeling is going to be essential in the diary entry during the Paris Peace conference. It might be good to use terms of hope such as, "I truly believe that this is the answer." You would want to use idealistic terms to reflect the sense of progress that Wilson possessed in the Paris Peace conference.
The second diary entry would contrast with the first one because it shows the reality of what happened. Wilson saw his idealism crash down into backroom deals, vengeful squabbling, and a harsh treaty that sought to punish Germany and the Central Forces. From the idealistic hope of peace, he saw retributions imposed, land taken over, and secret treaties created. Wilson ended up signing the treaty in order to walk away with something, but he was not happy with what resulted. Your diary entry could talk about the frustration Wilson felt seeing what he did. The perspective comes from the crash that results from dashed hopes. You could talk about how Wilson, felt "empty that something I yearned for wound up so gutted." This language reflects Wilson's despondency after experiencing so much optimism.