Trek makes tons of CF frames but only the 6 Series is made in USA (the Project One bikes are only 6 or Speed Concepts).

Your question about different CF though, is a 'big' one, in regards to 'how it's made'. The 6 Series are a smaller production run, according to orders received. Trek has a small core staff of cutters/layup and finishing staff, but will hire on extra hands as needed. The material cost of the frame isn't that much greater than the 600 or 700 OCLV, but of course, the cost for American workers is higher.

You should consider a Project One - they are offering a rebate! Plus you get to customise your bike.

ALso, be sure you understand which 'fit' you want: H1, H2 or H3.