The Great War was proof for all that technology and disciplined armies would triumph over large rabbles. The British Navy was suprisingly succesful with it submarine warfare, preventing large amounts of supplies from the Americas from reaching Europe. However the greatest victories came in the air. When the Prussian's first unleashed their airplanes upon French airships it was a slaughter as the maneuverable planes (that had been going through extensive testing for years) were incredably difficult targets for the French gunners used to shooting other airships, while the german pilots had no difficulty downing the massive lumbering airships. In a short amount of time the British had working planes aswell, and perfected the carrier airship, for deep raids into France and Spain. The near total aireal supremacy allowed the Prussians and Britisgh to destroy any airforce bases where the French tried desperatly to build a new airplane based airforce (or airnavy as it was referred to by 459ers). Even with their technological edge the task of winning the war was still arduous, as the ground forces of the Catholic allies were far larger, and the British had lost the Strait of Gibraltor to a massive enemy assualt, making Italy all but unsuppliable with the Turks having cut the Dardanelles of from everyone.
Due to the ground level deadlock the British and Prussian forces made one of the most daring assaults in the history of Dimension 459 and sent a fleet of carrier airships to beseige Paris. By cutting the city off the atheist and democratic people who had opposed the war from the start could take the National Assembly and form a new republic. However things did not go perfectly to plan as officials of the First Republic managed to flee the city, and caused a civil war with First Republic troops fighting Second Republic troops.
The British were also able to attack Rio de Janeiro, and bomb the royal palace, forcing the Brazilians to hand back Patagonia in exchange for peace. They also began war in the Carribbean with Quebec, though Quebec had managed to build some planes in North America and fought on. By 1930 Spain and Portugal surrendered, leaving Quebec and Southern France the only areas to continue fighting. In 1932 the Quebecois government accepted peace at the cost of the Bahamas, and a limit to their navies (air and sea). This left the First Republic the only enemy and they were finally crushed by March 23rd 1932.
The balance of power had been permanently disrupted in Europe, with Allemagne given occupation of Austria, the Papal territories hand the the new Democratic Republic of Italy, Prussia given the French Rhine territories and Kiel regions, and the reforming of Belgium. The French spirit had been broken but German nationalism awakened. In the 1933 election the Duetch Unity party one a majority in Allemagne, and a large chunk of the Prussian Parliment, causing the creation pf Deutchland from Prussia and Allemagne. Thus a war started to untie Italy ended up uniting Germany instead.