Try this: http://trainworld.us/NF2/nnew_ship_compair/shiptree/USN_shiptree.html

I can't be sure, but I think they're asking what level is the first American BB...

The Alaska battlecruiser is level 54, if you go the South Dakota line that's your first BB.

The Nevada is level 57, and is your first BB if you go the North Carolina line.

The ship trees and levels are right here online, and they're also on www.trainworld.us to
look up.

Could you re-phrase that? We're not sure what you're asking.