You have been isekaied to an early XX century style world were magic is real. This world is near to start the biggest period of conflict of its entire history, with similar scale to our own 2 world wars, and magic is going to be used in great amounts as a weapon by all the major factions. Fortunately, you will reborn as a extremly powerfull war mage, able to blow tanks, decimate armies and stop artillery shots. Your mere presence will be a major advantaje for wathever faction you support. But, who are you supporting? Choose:

  
Astrian hegemony: The Astrian dynasty unified a half of Urobian continent (the center and the south) throw political marriages and leaded the conquest of the new world during the exploration era 4 centuries ago. Their succes became a major problem as it puted the Astrians in conflict with near a half of the world, as multiple nations grew afraid of being absorved by their empire. This state of constant menace has made the army grew in power at the expense of the emperor, who now rules by name only. Astria is the world vanguard in magical investigation, producing the best battle mages (and the greatest number of them) of the world. The hegemony is near obsesed with the idea of the perfect soldier. Their magical experiments leading to the development of artificial sorverers, the chimera corps (soldiers turned theriantropes by mixing them with animals) and the inmortals (old veterans whose souls have been separated from their bodies, puted inside magical armors and send back to battle again, without feeling pain or tireness anymore) among other projects.

  
Western alliance: A coalition of nations leaded by the republic of Vermonde (the traditional rival of the Astrians in the continent), the kingdom of Albia (a major overseas colonial empire), the Kalmar union (who controls the north of Urobia) and the rising nation of Vinland (a union of independiced urobian colonies in the new world). The nations of the alliance have embraced the values of liberal democracy (free press, electoral system, free market) and pride themselves of defending this values against what they call "the three emperors" and have developed a huge entertainment industry (films, comics) arount battle magues, who serves as recruitment propaganda. The west leads the development of magitec technology, having the best magical guns, artillery and transports in the world. Their vanguardist industry, on the other hand, lies on the exploitation of the colonies, whose natives dont enjoy the rights and freedom the alliance preaches about.

  
Uskovian federation: Uskovia is the biggest unininterrupted united territory of the world, having a big part of both Urobia and the eastern continent under its control. Uskovia used to be a near feaudal nation, traped in the past until the equalist revolution took the power and started a huge process of industrialization. 12 years latter, the tsarist faction took the power back. Despite the mass execution of equalists that happened arter, the new tsar has fully embraced the industrialism they started, and Uskovia is now an industrial giant, extracting and procesing oil, metal, gass and wood at full speed. Uskovian industry is still backward compared with Astria and the alliance, but suppyes quality with quantity, producing 10 times more tanks and sending 10 times more soldiers. Uskovia has a long magic tradition, their wizards comanding ice, wind and snow against the enemies of the nation. Recently, Uskovia has broken the taboo about necromancy, increasing their manpower even more with undead forces in both as workforce combat force. "Dyning is no excuse to abandon the front" has became a motto in uskovian army. Also, many nobles have embraced the path of vampirism to reach inmortality, and  now,vampire elite forces spread terror in the easter fronts. Batlemages, even the ones of humble origin can achieve titles of nobility in Uskovia, so you would reach the higgest ranks of society.

  
Rising sun empire: The island nation of Katai was the first nation of the east to become aware of the need of embracing Urobian technology in order to hold its independence. Starting a fast process of industrialization and modernization that allowed them to reach the western standarts in few decades. Combining the modern weapons they took from the west and their traditional practices of ki and onmyo magic. After recruiting or enslave every yojai on the islands for the national army, Katai started a mass process of expansion, invading the considerably bigger nation of Tian Xia, and then the nations around it, and the islands in the eastern oceans. Neither the powerfull navies of the northen peninsula or the guerrillas of the southern jungle were able to resist. Now, the empire of Katai can only keep its expansion to territories under the control of Uskovia, Albia or Vermonde, so the conflict seems close to beggin.

  
The unselie covenant: Humans are not the only inteligent specie in this world. Elves, dwarves, merfols, orcs, giants and many other races inhabit it (and so the paralel fairy world), but the expansion of human nations have forced them to the deppest mountains, the dampest swamps, the deepest forests, the deep of the ocean and the fairy realms. To revert this situation, the elf queen of Alfar has convene the leaders of the most powerfull not human nations and forged an alliance to pulls back the humans and retake their place in the world. The covenant lacks mother technology, but suplies it with ancient magic. The fairy roads replace railways, allowing the covenant to open a portal in the middle of a human city, spread destruction, and run away. The covenant also includes powerfull creatures like trolls, dragons or krakens among their ranks, and magic  that can control the skies and oceans. The wrath of nature will end the human plage now (joining this faction requires you to reincarnate as a not human race).

  
The international army of liberation: The IAL is a recently formed colaboration net among multiple independence and resistance armies in the colonies of the previusly mentioned nations. Peoples from the southern continent of Afra, the new world, the southeast, the many islands of the oceans and even the minor not human comunities form the army, for the common cause of self-determination and freedom from the opresive rule of the colonial empires. The IAL, on the other hand, lacks a common project of future. Some of its factions want the return of their old nobility and royalties, others want a democracy, like the ones in the alliance, and others have embrace the ideas of the equalists. And despite the romantic discourse about brotherhood of all the opresed folks, many of these factions have accepted colaboration with the rival empires of their own rulers.

You are isekaied to a magic World War world. Choose Faction (descriptions in captions and text)