Why just educated America? People who are uneducated may still be depressed, but less educated about mental illness to try and address it.
A quick google search for studies of the correlation between wealth and suicide seem to confirm my view, eg "a 2009 Gallup survey [shows] the rate of depression is nearly twice as high for Americans making less than $24,000 a year than it is for those with annual incomes above $60,000." Of course, the real story is more complicated: It seems the correlation is much less clear for poor regions than for poor individuals, and I saw some suggestions that poor people living next to wealthy people were more likely to commit suicide.
And that's by choice - we've decided that we'd rather not give a shit about mentally ill people, because it might cost money. (Cf. the killing of the Mental Health Systems Act)