Why was it not possible to prevent the First World War? what were the goals and plans of the main participants in the war?

Why was it not possible to prevent the First World War? what were the goals and plans of the main participants in the war? What was the nature of the war for different countries?

This was due to the fact that the conflict itself had been brewing for a very long time. Russia wanted to annex the lands of all Slavs. Austria-Hungary wanted to seize Serbia. Turkey to achieve superiority in the Black Sea over the Russian Empire. Germany wanted to crush France. There were many more reasons. So the reason for the war was the incident that occurred in Sarajevo when Prince Ferdinand was killed.