I think the big thing is to keep ideology out of things. No ideological menace, just nations pursuing their own selfish interests.
Probably need a CP victory in WWI with the US staying out, and intervention to keep the Soviet Union from forming. Thus Europe is still acting as it has before, and still divided enough to be focused on their side of the Atlantic
The Joker in the deck is Japan, whose interests in China are opposed to US business interests, and threaten US possession of the Philippines. Have to keep Japan focused northwards rather than southwards until the US grants them independence, and then cause a rupture with the former colony. Best way would be a non Soviet Russia that looks to avenge 1904-05
Of course the US is still going to be intervening in Latin America, as prior to WWI (Nicaragua 1912-33, Cuba 1906-9, 1912, 1917, Haiti 1915-34, Columbia 1856 and 1903, Dominican Republic 1903, 1904, 1914, 1916-24, Hondouras 1903, 1907, 1911, 1912, Mexico 1914, 1916-17), but no farther