Question

Hoover's domestic policy was DIFFERENT from Harding's and Coolidge's because Hoover

Answer 1

Even though Harding, Coolidge, and Hoover were all presidents elected to office  for the Republicans, Hoover wasn´t really a conservative.

As the economy suffered due to the infamous stock market crash of 1929, Hoover explored non-conservative policies that his predecessors wouldn´t support. He expanded public works, signed into law the high peacetime tax increase and signed a tariff that would end up hurting foreign trade.