you can't migrate from eu to us i think. if you are an alliance twink, with good gear, you could migrate to the Misery, Tarren Mill and join Heroic twinks. and if your horde twink, you can migrate to Chamber of Aspects on Misery as well, horde side. very active twink twink players, talented etc etc.
or there is planty of players in Cyclone Battleground as well.
imo you need to create new account etc etc to play in US or i don't know if it is even possible, if you live in EU.
(*-.-*)Lónglife(*-.-*)