Americans certainly didn't want to get into a World Government with double-dealing Europeans whose specialty was secret treaty hidden behind secret treaty. The guest of honor, so to speak, stalked out of the banquet before the poisoned meal could be served. And, without American inclusion, there could be no meaningful World Government.
More bullshit. The League of Nations lasted a couple of decades after the U.S. Senate voted not to join in 2019, and only collapsed with the start of WWII because nations were reluctant to adhere to its goals of demilitarization and collective security.
“The League of Nations has been a disappointing failure... It has been a failure, not because the United States did not join it; but because the great powers have been unwilling to apply sanctions except where it suited their individual national interests to do so, and because Democracy, on which the original concepts of the league rested for support, has collapsed over half the world.” - Historian Samuel Flagg Bemis.

