In domestic affairs, he went along with the Immigration Act of 1924, which curbed the number of eastern and southern Europeans allowed into America and excluded the Japanese altogether. He also supported the Revenue Acts of 1924 and 1926, initiated by Secretary of the Treasury Andrew Mellon, the wealthy Pittsburgh banker who favored tax cuts for the rich. These acts freed up private funds that fueled the speculation behind the stock market crash of 1929. To make matters worse, Coolidge fought farm relief legislation that might have shored up the depressed farm economy.
Like Harding, Coolidge allowed his cabinet a free hand in foreign affairs...In Latin America, Coolidge's administration supported economic imperialism. In 1928 Latin American countries were eager to denounce U.S. business practices, and Secretary Hughes was barely able to dissuade them from passing a strong anti-U.S. resolution