Back during the bike boom, Canada had a tariff on imported bikes, so we ended up with not only CCM, but Raleigh and Peugeot manufacturing here. But the definition of "manufactured" varied abit. Companies like Norco bought Japanese frames and just built them up. Others like Miele built most of their frames, once they got their start on imported frames. But I believe Miele imported some high end Italian frames.

So defining what is an American made bike isn't simple. There will always be some American frame makers who do custom work. But it would be very difficult to get all components made in the US.