There are a few Americans still working at CX, mostly (90%) on CXF (Cathay Freighters) - who have the lowest (non-converging) pay scales and are strictly freight ops, based in the USA.
There has been a high turnover of Americans because of a number of factors, like time to command on the pax fleet (11 years at present), crappy staff travel, belligerent management, poor rostering (schedules), no bids or bid line system, yards and yards of reserve (no seniority based reserve system), zero cookie-chucker/flight-deck social interaction, family-unfriendly environment, almost no labor codes, etc., etc.
Having said all that, it beats welfare. As always, your call, but know what you're getting into.