After the Wickersham Report was published in 1931, Hoover rejected the advice of some of his closest allies and refused to endorse any revision of the Volstead Act or the Eighteenth Amendment, as he feared doing so would undermine his support among Prohibition advocates.[209] As public opinion increasingly turned against Prohibition, more and more people flouted the law, and a grassroots movement began working in earnest for Prohibition's repeal.[210] In January 1933, a constitutional amendment repealing the Eighteenth Amendment was approved by Congress and submitted to the states for ratification. By December 1933, it had been ratified by the requisite number of states to become the Twenty-first Amendment.[211]

Foreign relations
According to Leuchtenburg, Hoover was "the last American president to take office with no conspicuous need to pay attention to the rest of the world". Nevertheless, during Hoover's term, the world order established in the immediate aftermath of World War I began to crumble.[212] As president, Hoover largely made good on his pledge made prior to assuming office not to interfere in Latin America's internal affairs. 