World War II causes

2. freedom from disturbance; tranquility.
6. state or assert that something is the case, typically without providing evidence or proof.
9. an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else.
11. an important topic or problem for debate or discussion.
12. put an end to the existence of (something) by damaging or attacking it.
14. a state of armed conflict between different nations or states or different groups within a nation or state.
15. a formally concluded and ratified agreement between countries.

1. the state or fact of having a duty to deal with something or of having control over someone.
3. formally put an end to (a system, practice, or institution).
4. an organized military force equipped for fighting on land.
5. obtained or imposed by coercion or physical power.
7. successfully bring about or reach (a desired objective, level, or result) by effort, skill, or courage.
8. interfere with the normal arrangement or functioning of.
10. keep safe from harm or injury.
13. the ability to do something or act in a particular way, especially as a faculty or quality.