Contemporary history 3 questions

Tension between the Austrian Empire and Serbia was a major cause of the First World War. 1: The main causes of this tension were issues involving ethnicity and nationalism. What were the differences between these two nations on these issues and how was most of the rest of the world dragged into war because of their dispute? BE SPECIFIC AND USE YOUR OWN WORDS
2: How did nationalism and imperialism complement each other in the territorial expansions of the European powers in the late 19th century?
3: For Bismarck, what was the purpose of all his multiple alliances and treaties? What tools did he use to make these alliances and hold them together?

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