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It started with a conflict between Serbia and Austria-Hungary. Russia defended Serbia (they were allies), which caused Germany to aid Austria-Hungar as they were also allies. The rest followed suit by accompanying their allies. Basically, they were allied to the countries who originally had the conflict.
Germany, Austria-Hungary, and Italy
Austria-Hungary, Mentenegro, and Serbia
There was no official change in territory or policies.
Three nations belonged to the triple alliance and they were Germany, Austria-Hungary and Italy.
Austria-Hungary was separated into two different countries Austria and Hungary
It didn't increase the tensions all over Europe. Just in Serbia and Austria-Hungary, seeing as it was a political issue between those two nations. It was also the final straw in the diplomatic conflict between them in Austria-Hungary's eyes.
Russia stepped into the Austro-Serbian conflict over borders that erupted into Archduke Ferdinand's assassinations. Thus, it enlarged an issue between two nations. And its early, preventative, troop movements towards Germany angered that country so that it entered war.
Austia-Hungary did not exist anymore in WW2. It became Austria and Hungary, two separate nations. Austria was annexed to Germany in March of 1938. Hungary became a German ally.
Austria-Hungary
Germany, Austria-Hungary, and Italy
Austria-hungary and russia