What was the cause of World War One ? Using alliances nationalism and militarism

The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism. This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land. The overall cause of World War was the assassination of Archduke Franz Ferdinand.

Explanation:

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b) race riots in several cities

silk

indigo  

rice

all the other answers are wrong