What did the author mean when he said "the cause of america" is "the cause of all mankind

When the author said "the cause of America" is "the cause of all mankind, he is refereeing o the worldwide plight of people under oppressive government and all of those individuals are struggling against them, the struggle for the cause of America is a symbolic statement for the struggle for the cause of humanity worldwide wherever the same kind of circumstances are found. 

a. wisdom because says disclosed with sign, which means you have to know, and having to know something is close to wisdom.