What is the story of XCOM 2?

Related questions

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2. How many missions are in XCOM 2?
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5. Is XCOM 2 Difficult?
6. What was the first XCOM game?
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Tags

1. #avenger
2. #original
3. #resistance
4. #named
5. #alien
6. #enemy
7. #failed
8. #organization
9. #future
10. #airship
11. #aliens
12. #player
13. #mobile
14. #hiding
15. #introduced
16. #after
17. #forced
18. #unknown
19. #defeat
20. #supply
21. #retrofitted
22. #where