Based off TL-191:
The Confederacy won the civil war. More then that, they have managed to gain some more territory and have subjugated Mexico. They took part - along with their British and French allies - in the construction of the Panama canal. Thus they managed to grow economically and as a result of foreign pressure and industrialisation the CSA has abolished slavery, and by a majority of 2/3 of the Confederate congress. Now with the free blacks the CSA economy grew even further. However that is not to say that economy - as well as revanchism - has declined in the USA. In the Yankee north there is contempt for anything southern and the tensions along the border only keep rising, as both nations are fairly powerful.
In Europe and Africa, the situation went as it has IOTL, and in the early 1900's tensions rose between the Entente and the central powers. In Austria-Hungary, the Habsburgs created a federation involving all of the peoples under their rule, thus keeping a stable rule agreeable upon whole its people. There was one slight modification in the Ottoman Empire, though - insted of being deposed, the Sultan Murad V (who favoured reforms) was not deposed and was not replaced by his tyrannical brother Abdulhamid. As a result, the Ottoman Empire grew more liberalised, modernised and westernised and managed to become a stronger power and take better hold of the Arabian peninsulla, destroying those pesky and annoying Saudis an keeping some (more) territory in Europe. Ethiopia, however, wasn't only succesful in resisting foreign occupation - it was also succesful in Modernisation and has made steps to replace their 18th cannons with modern weapons and to build their first factories.
An even greater change was that in China - after realising their folly, the Chinese have begun modernisation and westernisation of their country following the failure of the Opium wars. The subsequent reforms did not make China fully westernised and most of the country remains agrarian, but the Qing dinasty is a much greater force to be reckoned with - much more then IOTL. China's opinion in foreign relations truly matters. The Qings are much more stable and their rule does not collapse as it did IOTL in 1912 and China only remains strong.
In South America the Emperor of Brazil was not deposed and the Coup against him failed. Pedro II went on to rule his country until 1893 when he died in peace. The stability of Brazil remained and since it has puppetised Paraguay in the War of the Triple Alliance - unlike OTL - it is stronger, perhaps even having a say in foreign policy. And Bolivia -well, irridentism and revanchism hardly ever die and the Bolivians wish to gain back the lands which they have lost to the Chileans 30 years ago, and Argentina supports them - which raises tensions between Chile and Argentina, the latter also supported by the UK.
And then the Archduke got himself all dead.
The following war began as it has, but ITTL the USA immediately showed its support for the Central powers- hoping to impress their German allies and to aggravate their Southern neighbour. As a result, the CSA has stood besides their allies in the Entente. Needless to say tensions rose pretty quickly and war between the two ensued. The Yanks invaded Canada and managed to capture British Columbia with little resisting, then pushing forward to Alaska and conquering it as well. In the East, Quebec was conquered with even smaller resistance and out of it the USA created the Republic of Quebec, which was a puppet of the USA. In Ontario there was some notable resistance, especially in Toronto. However this was not enough. As the situation in the South was stagnating, the one in the north was going rather well. The governor-general of Canada - realising he has no chance of winning - quickly signed a peace treaty with the Americans by which Canada cedes Yukon, British Columbia and the Maritimes to the US and recognises Quebec as an independent republic. The troops now turned south and and managed to help a bit, however Mexico was forced to join the war on behalf of the CSA due to it being partially-puppetised by the CS. To counter that, the US convinced Guatamela to join the war on their behalf, and encouraged Yucatanese seperatists to revolt, so as to force Mexico City to turn its attention elsewhere.
In South America, Bolivia thought the time to be fit and attacked Chilean troops, with little success on either side. Argentina was supplying aid to the UK as a result of the two countries' friendship. Argentina decided to assist its Bolivian friend and attacked Chile. Brazil then clearly saw the situation as advantageable, and - alongside their little Paraguayan ally - invaded both Bolivia and Argentina, putting it in a collision course directly with the UK, which sent ships to secure the supply routes from south America. Those ships were attacked by Brazil and Chile, and as a result of the situation in both North and South America, much of the British navy was forced o turn its attention into places which were not the North Sea. The result was a loss at the battle of Jutland, which led to a severe weakening of the British blockade over Germany, allowing Jerry to prosper even during wartime.
Germany was more succesful against the Belgians as a result of better preperation and the help of the Netherlands - which joined to war on the side of the Central Powers. Germany was advancing - albeit quite slowly - into France, and a more-competent Austria was fighting off the Italians and little Serbia was no match for them. Even more pressure was put on the Eastern front. Portugal joined the war as well, however one thing much more important - Spain. Spain assisted Germany in the war effort before but now in 1916 it was officially at was with the entente. Much pressure was put in the Carribbean, and even more in Pyrenees and against the Portuguese.
The Ottoman Empire managed to attack the Suez canal quite succesfuly, and by the summer of 1916 most of the Sinai was at their hands. Without the British so powerful as before and without the Arab revolt even the Southern part of Arabia was now in Ottoman hands. The advance into the Caucasus against Russia was led not by Enver Pasha, but by a more competent man, who did not hesitate to give his men proper winter equipment. the Caucasus campaign was a great victory for the Ottomans, but it made the Russians and their British allies fear. Not only Arabia and the Balkan in CP hands, but now the hinterland of Russia. Using their influences in Persia, the Shah of Persian declared war on the Ottomans. He was not succesful and in march 1917 Tehran was occupied.
But British India was still British, and the Germans had to do something about it. So the Chinese stepped in and through a series of secret agreements with the Dragon Emperor's officials it was decided that China will recieve extensive swaths of Land in return for their involvement, including the right to annex German possesion in East Asia after they take them from the Japanese. It was succesful. Through the Himalayas, Chinese troops ascended against British India and incited the people into revolts. They occupied and annexed Transamur and advanced much into Siberia and some parts of Central Asia. Indochina was attacked by the Chinese and the French could do little to defend their colonies. The Spaniards in the Philippines and the Dutch in Indonesia attempted to help to the campaing, as well. Korea was being occupied from the North, but Formosa was still in Japanese hands. It will go the China after the war.
Even Ethiopia joined the war on behalf of the Central Powers, and they even managed to occupy the Horn of Africa and have proven themselves helpful in the Sudan.
French troops began to mutiny and the Germans quickly knew how to exploit that, and have come to the outskirts of Paris. In the Americas the Etnente was pushed back, with the warfare being much more dynamic than in Western Europe. the Western half of the CSA was mostly Yankee-occupied by this point and US troops were closing in on Richmond and its Grey House. Chilean and Brazilian troops were advancing all the way and the Guineas were under Brazilian and Dutch comination. The Spaniards advanced deep into southern France and into Portugal, and the Austrians have took over Venetia and most of Serbia. Macedonia was wrestled away from Serbia by Bulgaria, and the fate of Dobruja was similiar. The rest of Romania was occupied by Austrian troops, and the rest of Eastern Europe mostly by Germans. The Russians revolted and pulled out of the war, then only descending into civil war between the Socialists and Monarchists. The Ottomans held the Caucasus and occupied Saloniki and Persia and advanced quickly into the Turkic-speaking lands in Central Asia and have begun to advance into OTL Pakistan. In Central Asia they have met with Chinese troops.Both Ottomans and Germans poured in from the Sinai into Egypt and occupied Cairo. Infact, German colonies were now being liberated - in 1918. They were mostly conquered by the Entente earlier during the war, but were now being taken-over again.
On December 5th, 1918, the Battle for Paris was over. All French and British troops in the city have surrendered and the French Capital was conquered. This day the French government surrendered, facing demise on all possible fronts. Three days later - with most of their troops trapped on Mainland France or hopeless in the colonies - London handed its surrender over to the Central Powers. Four days later - with American troops at the outskirts of Richmond - the CSA followed suit.The rest of the Entente governments did the same in the following three days, and the war was officialy over.
On the loser's expense, a "peace conference" was held in the Versailles palace outside Paris. This conference collapsed old orders and changed the world. It also squeezed all it could out of the humbled Entente Powers.
Bellow is a map showing the sides in the war before it began(Entente in green, sentral powers in orange), and a map showing the outcome of the peace conference: