natives likely met American black bears when they crossed the Bering land bridge 1000s of years ago but most people use the term 'discovered' to mean 'by science'. so for that definition, I'd say early to mid-1700s when European naturalists first began to describe animals and plants with binomial names.
Black bears are not endangered, but they are threatened.
Black bears have been known to mankind for hundreds of years and it is not recorded who discovered them
They are both bears.
American Black Bears have full color vision.
Asiatic black bears are about 2 times smaller than american black bears. Males are usually near 330 pounds, and american black bears can be as much as 660 pounds. They have a large cresecent moon-like mark on their chests, and their face is usually rounder with a shorter jaw. Asiatic black bears are much more aggressive than american black bears.
A family of american black bears.
The American black bear fears only humans and brown bears.
forageing
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Yes, American black bears are known to congregate and create dominance heirarchies.
Asiatic black bears are the same size of american black bears. Males are usually 600 pounds.
Ursidae