An isolationistic USA for the entire 20th century. Probably need to get rid of Woodrow Wilson and Theodore Roosevelt for that.
President Martin Luther King ( Civil Rights movement wank)
A Prague Spring style government in the GDR (mid to late 70s)
The Socialist International preventing WWI.
Trotsky and Stalin in exile together on a tiny remote island.
Hitler drafted I to the Austrian army. ( He was a conscription Dodger and arrested in spring 1914, send to Vienna but regarded unfit for service. Somehow it is always the art school thing that comes up)
And for a distopian TL: South Africa post 1980, everything goes the worst way possible.
We once had an attempt for a successful prosperous Somalia. Loved the idea. But I must admit I had to start reading up on the real history.
No special USA - Saudi-Arabien Relations.
USSR wins the Winter war and conquers Finnland.
Communist Japan.
France Euro Referendum goes the other way, France keeps the franc. Project is shelved.
King George VI. dies in a bombing raid during the Blitz. Queen Elizabeth II. becomes Queen at age 14.
Boxer Rebellion more successful.
Breaking up Italy.
No Korean War.
Democratic Belarus.
Distopian TL about Spain post Franco.
Successful 1968 revolution in Paris.
GDR style Eastern Austria.