How did Herbert Hoover earn the nickname the great humanitarian?

Herbert Hoover earned the nickname "the Great Humanitarian" primarily for his extensive relief efforts during and after World War I. He led the Commission for Relief in Belgium, successfully organizing food aid for millions of starving Belgians, which showcased his ability to mobilize resources for humanitarian purposes. His reputation for compassion and efficiency in addressing food shortages and suffering further solidified this nickname, particularly as he continued these efforts during the post-war period.