Conversation so far:
Who were some of the members that were invited for a special sceening of The Birth of a Nation?
A special screening of The Birth of a Nation was attended by President Wilson, members of his family, and members of his Cabinet.
Was there anything suprising about The Birth of a Nation viewing by President Woodrow Wilson?
There is dispute about President Wilson's attitude toward the The Birth of a Nation.
Did any other political parties view The Birth of a Nation besides President Wilson?
A newspaper reported that President Wilson received many letters protesting against his alleged action in Indorsing the pictures [sic], including a letter from Massachusetts Representative Thomas Thacher
Are there any other interesting aspects about this article about The Birth of a Nation special screening at The White House?
The showing of the The Birth of a Nation had caused several near-riots.

Question: why was he approbation about?
Self-contained rewrite: What was President Wilson's approbation about with The Birth of a Nation?