Huh? Unless you're Rip Van Winkle, it doesn't seem strange at all that you never hear the term, 'negro', anymore. That word fell out of favor in the late 50s. About the only place you see it these days, is on birth certificates.
My personal preference is, 'black', but the world seems stuck on the stupid, 'African-American' label.
I grew up in the South in the 60s and “Negro” was the accepted term. The true Southern ladies said “Nigra”.