Most of my basses are American made (6 of my main 7 basses anyways) and I prefer American made basses. Most of my basses are fairly new though, too.
I am not being patriotic (I am Canadian) but a made in America bass has always denoted highest quality to me. Maybe because when I started playing bass 25 years ago, most professional quality basses (Fender, RIC, Musicman, Gibson, Alembec, Pedulla, etc.) were ONLY made in the USA. Far east (including Japan) made guitars were GENERALLY crap back in the '80's. There were exceptions such as Japanese Squiers, but for the most part far east built basses were not much good in general. Spector, Warwick and other European makers were just starting to make names for themselves also, but not really on the radar back then.
Now? IMO Japanese, European and even Canadian manufacturers can and often do make better basses than those made in the US.
My Japanese Sadowsky MS5 is built AS good as my Sadowsky NYC or 3 recent EBMM Stingrays. Same with my Japanese Geddy Lee Jazz and Indonesian Squier VM fretless Jazz. Amazing build quality on both.
To answer the initial question... I PREFER American made as I love EBMM, Fender and Sadowsky basses. Would I buy an expensive Japanese, Chinese, Korean or European instrument? If it looked, played and sounded good.... absolutely. I have owned a Warwick and a Korean made Lakland that were both great basses.
I agree that the CNC machines and general technological advancements we have seen in recent years are really taking the human aspect (or at least inconsistancies bases on human error or lack of training/skill) out of the equation (which can be a good thing).