When did Portland Timbers join MLS?

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Tags

1. #champions
2. #portland
3. #cooper
4. #kenny
5. #western
6. #conference
7. #finished
8. #first
9. #their
10. #against
11. #timbers
12. #scored
13. #played
14. #season
15. #colorado
16. #rapids
17. #march
18. #reigning
19. #place
20. #overall