The General Timeline-Layout so people can hop in/see the minor changes prior to 1914
Following Roosevelt's early term in 05' he begins building up the US Military in a way that leads the world to follow this general trend of embracing technology.
This however doesn't mean all sides are equal on tech or tradition, but in face of being left behind they chose to look forward. I've written documents on this progress over on the read-only version of the TL. but Generally there are more Dreadnoughts and Aircraft in use before 1914. Not enough to be completely dominating, but it leads to earlier air war, and more unique lessons learned about modern warfare. In this TL the Russo-Japanese war is studied more so by the Russians when it comes to officers and signals intelligence, while the Japanese similarly draw their own conclusions on how they fought the war.
To make a huge point small and not give all the cards out, generally all the major and minor powers look to this and come up with how they think modern war is going to be fought and won. For instance the British and French embrace the LWMG and Arty while Germany and AH love the MG and infiltration styled approach to warfare. The Russians while disliking modernization and such, generally expect to lose a war with Germany and so from 1908-1914 set up training for NCO and Officers, aswell begin reforms to education and society. Is it going to work, who knows but it is better to overestimate your enemy than underestimate him.
I'll be doing a casualty count for the end of 1914, but as of now all sides have suffered more than 40k deaths and 80k+ wounded/captured/missing.