
Gerald Ford was honestly the most inconsequential president of the 20th century.
The only noteworthy thing he did was pardoning Nixon, which contributed to the nation's increasing pessimism. But the nation's pessimism had much bigger and more important reasons (JFK's death, Vietnam, negative reactions to civil rights gains from both the left and the right, stagflation, Watergate, etc) than Nixon's pardon, so even the pardon is relatively unimportant. Besides that, what else did Ford do? Implementing austerity? Sure, but that didn't really fix the issue of stagflation. So his presidency was kind of a nothing burger in terms of impact.
Everyone else was more important: McKinley's imperialism gave the U.S. territories that it still has to this day, TR is self explanatory, Taft oversaw the creation of the federal income tax, Wilson is self explanatory, Harding and Coolidge's economic policies laid the groundwork for the great depression, Hoover shitting the bed so badly gave rise to FDR and the New Deal, everyone from FDR to Nixon is self explanatory, Carter's mediocre leadership gave rise to Reagan, Reagan is self explanatory, Bush oversaw the end of the Cold War, and Clinton signing NAFTA was a very consequential action that we are still feeling the effects of decades later.
With that being said, I can confidently say that Ford was the most filler president of the 20th century.