I'd hardly call them an American team.
Telekom > T-Mobile > High Road > Columbia
All they did was change the country of their license.
Gives them an image change from the T-Mobile bad publicity of the few years before hand.
In affect it's worked because people (as seen above) are refering to them as a US team blah blah blah.
As for Levi, I don't think he has any grounds to be bitter. He signed with Astana in full knowledge of what occurred at the TDF in 07 and the drama that followed. He & the others would surely have known of the threats of Astana not being invited to the tour. Unless he lives under a rock somewhere in the middle of nowhere and clearly didn't read the news during the tour. He must have wonder where all the Astana riders disappeared to, probably thought he dropped them.