This page shows the main differences from OTL in English World timeline.
The OTL United States is balkanized, but the countries are (mostly) friendly to each other. And (obviously) the USA doesn't exist (New England has the place of the USA and Borealia somewhat has the place of Canada). While some countries are balkanized...
OTL Austria (Upper+Lower Aus, Tyrol, Salzburg, Klagenfurt)
OTL Italy (Piedmont, Corsica+Sardinia, Venice, Papal States, Abruzzo, Sicily, South Italy)
OTL Australasia (Australia, Westralia, Victoria, Northern New Guinea, New Zealand, Southland)
...others are in unions:
Scandinavia (Denmark, Iceland, Norway, Sweden, Finland, Karelia, Murmansk)
German Empire (Germany, Alsace-Lorraine, Kalinigrad, Prussia, German territory lost to Poland)
Turkestan (Central Asian states)
Arab Union (Saudi Arabia, UAE, Oman, Yemen, Iraq, Syria, Lebanon, Kuwait, Sinai)
West Africa (western Africa)
Union of South Africa