Why did Houston Astros switch to American League?

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Tags

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2. #cities
3. #rangers
4. #because
5. #joined
6. #texas
7. #rivalry
8. #create
9. #balance
10. #national
11. #teams
12. #chosen
13. #divisions
14. #league
15. #leagues
16. #switch
17. #three
18. #bigger
19. #effort