What is the worst history war thats ever happend

Which of the following is one example of an ideological conflict that became one of the causes of world war ii?

Match the vocabulary word with its meaning. 1. gender a large-scale spread of a deadly disease 2. pandemic the development and use of machines, devices and ideas to further people's knowledge 3. technology the sex of a person, whether male or female

Why did stalin want control of eastern europe after ww2?