It was during the reign of imperator Woodrow Wilson that the US got dragged into foreign conflicts that were none of our business. The entry of the USA in WWI prolonged that conflict by seveal years, and brought about the collapse of the Ottoman, Russian, and Austro-Hungarian empires, followd by the rise of national and international (German and Russian) socialism. Wilson's reign also saw the percentage of the national GNP confiscated by the central/"federal" government rise from 8% (less than God requires) to 20% (double the tithe).
While president at Princeton U, at the age of 50, Wilson indulged in an extramarital affair -- and from that point on was never able to make a mistake. In his own eyes, at least. It was at some point after this event that he conceived the notion of outperforming Jesus, Who could only speak of the desirablity of peace on earth, while He, the great Wilson, had a scheme (his word) to make peace happen.
We could rank them in various categories: foreign policy foolishness, domestic policy foolishness, post-presidential stupidity.
A "quien es mas macho?" format would be suitable.
The US entered World War I on April 6, 1917. The major phase of the war ended on 3 October, 1918 with the German surrender (the Austrians held out for another month until November 3d). How could that be construed as "prolonging" the war by "several years"?