What 20 years? Wilson (D) went from 1912-1920, Harding (R) from 1920-22, Coolidge (R) 1922-28, Hoover (R) 1928-1932. The problem was the ideas promulgated by the Progressives, including Teddy Roosevelt, like the income tax, Federal Reserve, and popular election of Senators came about under TR and were pushed by Taft, and signed by Wilson, or ratified while he was President. FDR took over in 1932 and expanded on the "progressive" programs instituted by his Republican predecesser Hoover.

If the American People allow private banks to control the issuance of their currency, first by inflation, then by deflation, the banks..., will deprive the People of all their Property,...Thomas Jefferson