| February 2009 |
| 12/02/09 | The alliance koala-SR (today: YU) was founded. |
| Founding members::  RICKO, molekul, Ana, BHFanaticos, black_mamba82, stara and shone333. |
|  The alliance reaches a population more than 5,000. |
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| 14/02/09 | Joining of:Nokianas. and usuey. |
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| 17/02/09 | Joining of:pongkale. |
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| 18/02/09 | Joining of:obiCMOn. |
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| 20/02/09 | The alliance reaches a population more than 10,000. |
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| 22/02/09 | Joining of:Hellrider and NikolaRadojkovi. |
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| 25/02/09 | Joining of:LOOL. |
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| 27/02/09 | Joining of:Neverland. |
| Leaving of:Nokianas.. |
| March 2009 |
|
| 02/03/09 | Joining of:Kleopatra1. |
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| 03/03/09 | The alliance is now known as koala-U. |
| Joining of:Ashoka, wenling, GeDoRa, Spawn3, da1, mdg357, Liadan, burningwater, sieugaa and Revilo. |
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| 04/03/09 | Joining of:Bamba and RsRobot. |
| Leaving of:LOOL. |
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| 05/03/09 | Joining of:Cacciaribelle. |
| Deletion of:wenling. |
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| 06/03/09 | Joining of:RebelArmy and BlackTiger. |
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| 07/03/09 | Joining of:Perak. |
| Leaving of:Ana and Liadan. |
| The alliance reaches a population more than 50,000. |
|  The alliance have their first conquest. |
|
| 08/03/09 | Joining of:dosvan. |
| Leaving of:Neverland Ashoka Spawn3 mdg357 sieugaa Cacciaribelle RebelArmy and dosvan. |
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| 09/03/09 | Joining of:Ana. |
| Leaving of:Hellrider NikolaRadojkovi Kleopatra1 da1 burningwater Bamba RsRobot and BlackTiger. |
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| 10/03/09 | The alliance is now known as YU. |
| Leaving of:black_mamba82 and Revilo. |
|
| 11/03/09 | Leaving of:molekul. |
| Deletion of:RICKO stara shone333 and Ana. |
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| 12/03/09 | Deletion of:obiCMOn and GeDoRa. |
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| 15/03/09 | Leaving of:usuey and Perak. |
| Deletion of:BHFanaticos. |
| April 2009 |
|
| 17/04/09 | Deletion of:pongkale. |
| The alliance YU was canceled. |