Lol what.
I think they both had troubles with the Catholic Church and they both had multiple affairs with women.
Those who opposed the United States joining the League of Nations feared it would involve the US in more European affairs and cause more disconcert in America (aka more casualties).
It was looked down upon because it reminded many of the colonial times being ruled by a foreign power
USSR
Who alone.. Could imagine sending so many men to die. It was sending millions of men on deathly charges.