(THIS STUDIO IS WIP, YOU CANT CHOOSE ANY COUNTRIES YET)
An Alternative War is a universe completely different from our own, with the Roman and Byzantine Empires never falling, but shrinking instead, the Russian Empire lives longer, France and Poland are split, and many other things are changed. Rising tentions have caused disputes between nations, which, will eventually cause, the Great War.
Your manpower and GDP will be based off of the nations actual manpower and GDP during the time. However, some nations might be tweaked, for example: Polish states, Roman and Byzantine empires, Germany, and England (Anglo-Welsh Union).
Germanic Union - @Ontario_Mapping