How did Germany encourage Austria to go war against Serbia?

Germany gave Austria-Hungary a "blank check" of support. This meant that Germany would back Austria-Hungary no matter what it did, even if it went to war with Russia. This encouragement played a major role in convincing Austria-Hungary to declare war on Serbia, which sparked World War I.

Here are some specific ways in which Germany encouraged Austria-Hungary to go to war:

* Germany told Austria-Hungary that it would support its annexation of Bosnia and Herzegovina. Bosnia and Herzegovina were two provinces of the Ottoman Empire that Austria-Hungary had occupied in 1878. Serbia also wanted to annex these provinces, and its anger at Austria-Hungary's annexation was one of the factors that led to the war.

* Germany promised to help Austria-Hungary if it was attacked by Russia. Russia was Serbia's ally, and it was clear that Russia would go to war if Austria-Hungary attacked Serbia. Germany's promise of support gave Austria-Hungary the confidence to attack Serbia, even though it knew that this would likely lead to war with Russia.

* Germany helped Austria-Hungary to prepare for war. Germany provided Austria-Hungary with military supplies and helped to train its troops. This assistance made it possible for Austria-Hungary to fight a long and bloody war against Russia and Serbia.

In conclusion, Germany played a major role in encouraging Austria-Hungary to go to war against Serbia. Germany's support was crucial in convincing Austria-Hungary to take the risk of war, and it helped to ensure that the war would be a long and bloody conflict.