1) Mussolini never leaves the Italian Socialists or dies of a heart attack brought on by being a huge fat douchebag, subsequently allowing fascism to stay as an actual Third Way movement, rather than just right-wing totalitarianism masquerading as something good and wholesome.
2) Stalin is killed in 1925, allowing the USSR to become an actual centralized communist democracy and a major, anti-colonialist world power.
3) The Mongols don't stop at Vienna and proceed to ravage all of Europe, destroying Christendom permanently(sans Scandinavia and the British Isles). Eurasia is subsequently united under a powerful Mongol Khanate, and trade and culture begin to flourish once more across all Eurasia. Later on, the Mongols will colonize the New World, and will not have the technological ability to completely destroy most of the New World's natives, allowing native nation-states to rise up throughout Mesoamerica, the Great Lakes, and elsewhere. By 2011, the world is a peaceful patchwork of multireligious, multiethnic empires, while national boundaries are quickly beginning to mean nothing. Technology is similar to the 1950s, with some anachronisms and leaps forward. The grand global empires have begun to "outsource" competition that would otherwise explode into violence into peace competition for territory in outer space, as the Space Race begins to heat up between the Mongols, the Japanese, the Ayutthayans, the Bantu Federation, the Aztecs, the Maya, the Long House Federation, the Likan-antay (in South America), and the Polynesians.
Truly a glorious world.