There are 16 subspecies of Ursus americanus, the black bear. The Wikipedia article describes their different physical characteristics and geographical distributions, but not differences in temperament.
The article discusses attacks on humans, and attributes the majority to habituation to people and easy access to food. When access to food was made more difficult, bear attacks dropped off sharply.
Is there any analysis or evidence -- even informed anecdotal -- that suggests that any subspecies is more aggressive or more easily provoked to aggression than another? Can any differences be attributed to the frequency and nature of exposure to people? I read one article a long time ago in connection with an attack on several male teenagers that said that eastern black bears were more aggressive than western; this is all I remember about it.
My first hand knowledge is limited to Sierra and (to a lesser extent Colorado Rocky Mtn) black bears. None has behaved in the least aggressively towards me, but I still respect them. Should I be even more respectful elsewhere?