His literary work enabled him to reach a higher status as Paul Cambon's partner, the Minister of France in Tunisia, in 1882.

Thus, during 22 years, Jusserand was the French politic spokesperson alongside 5 presidents of the United States (Roosevelt, Taft, Wilson, Harding and Coolidge)[citation needed], especially he had served as Dean of the Diplomatic Corps from May 1913 to January 1925.

[citation needed] Jean Jules Jusserand played an important role in the United States's entry into the war.

On 2 April, he announced to Congress that he wished to go to war alongside the Entente, sending troops on French soil, thus directly entering the conflict.

Jean Jules Jusserand said on this occasion: "For the first time, a neutral nation has decided to enter the conflict without prior bargaining, without having laid down a condition.

"[citation needed] On 10 May 1917, French Prime Minister Georges Clemenceau sent him a telegram to congratulate him on his action, saying "All you have said is excellent."

[citation needed] He helped to support of professor Thomas Garrigue Masaryk legions especially in Russia and in negotiation for independent Czechoslovak state in America from May to October 1918.

[citation needed] Even after the First World War, Jean Jules Jusserand was still fighting to maintain the peace obtained after so many efforts and sacrifices.

He accompanied the American President Woodrow Wilson to the Paris Peace Conference (1919), during which was signed the Treaty of Versailles on 28 June 1919.

[citation needed] He remained the French ambassador to Washington for the next five years under presidents Warren G Harding and Calvin Coolidge.

[citation needed] In 1923, Jean Jules Jusserand presided and delivered a speech during the inauguration ceremony for the American war memorial.

[citation needed] On 10 January 1925, a farewell banquet was organised in his honour by the American government in order to express their esteem and gratitude.

[citation needed] Even today, different monuments exist in France and the United States in order to commemorate Jusserand's diplomatic role.

[citation needed] A pink granite bench in Rock Creek Park honoring Jusserand was dedicated by President Franklin Delano Roosevelt on 7 November 1936.

[9] In 2014 Washington City Paper called it the "best obscure memorial" in D.C.[10] He wrote a series of articles published in Cosmopolis: An International Monthly Review on the history of French reactions to Shakespeare.

[11] Jusserand was a close student of English literature who produced some lucid and vivacious books on comparatively little-known subjects: