[PAR35]

The most likely outcome of World War I sans our misguided participation would have been a stalemate with both sides exhausted from 5 years of trench warfare.

No, if Wilson hadn't hoodwinked the American people, the likely outcome of World War I would have been a German victory. Once they took Russia out of the war, the troops from the Eastern Front would have been available to go after the British and French.

The 1920s and 1930s would have been much different.

[NVDave]

More than a German victory, it might have stalled or precluded the end of the Ottoman Empire. The middle east would be completely different, with a vastly different map, if the Ottoman Empire had endured.

[Polybius]

...... the likely outcome of World War I would have been a German victory. Once they took Russia out of the war, the troops from the Eastern Front would have been available to go after the British and French.

It is not a matter of "would have". The German did transfer nearly 60 divisions from the Eastern Front to the Western Front after the Russian capitulation in 3 March 1918.

The resulting German offensive from 21 March to 18 July 1918 still stalled at a time when America had not yet made its weight felt on the battlefield.

1918 Spring Offensive or Kaiserschlacht

The offensive left the Germans exahusted and their territorial gains worked against them as the gains created salients that were difficult to defend.