If we were truly still leading the way, the supercollider we had plans for that was 3 times as powerful as the LHC would've been funded, in the 70-80's. I can't argue that point effectively though because I have read that project was plagued with issues and most likely wouldn't have been an effective use of funds, but we could've focused on fixing those issues or finding a scaled back project instead of letting it die, and leaving it to the EU.