I would call it a tie between Coolidge and Hoover. It was not Harding or Wilson.
Calvin Coolidge served the most years in the 1920's.
Franklin Roosevelt
Yes, in 1920s Franklin D. Roosevelt was the unsuccessful democratic nominee for president of the US.
Warren G. Harding
The 1920s included:The Great Depressiontension between modernism and fundamentalismrebellion
During WWI Woodrow Wilson was president, Coolidge followed him (early 1920s)
Calvin Coolidge was the president during most, if not all, of the flapper era, aka the roaring twenties.
They were largely inactive and allowed businesses to grow unregulated.
Babe Ruth
Ronald walker is the best
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fluctuating