There are a couple of all-male colleges left. At one time, most colleges were sex segregated. During the 1960s, most them went co-ed, frequently by absorbing an associated women's college (think Harvard-Radcliffe). Most colleges could be termed "historically White," as well, since for most of their histories black students were few and far between. Morehouse is not, however, strictly black. In 2008, the class valedictorian was white.
And the Supreme Court forced my alma mater (VMI) to go co-ed in 1997. My school is a shadow of its former self.