Black National Anthem Promotes Segregation

Bill Maher laid it all out Friday night ... saying the United States is becoming a segregated nation again, and the latest evidence is the push for 2 National Anthems.

The "Real Time" host blasted the NFL for playing "Lift Every Voice and Sing" -- often called the Black National Anthem -- in addition to the OG N.A. at football games.

Maher's not against a new National Anthem -- one that better reflects current times -- but he's flatly against more than one.

His argument goes like this ... Martin Luther King and many others fought hard -- even some losing their lives -- to end segregation. The battle was won 67 years ago when the U.S. Supreme Court put an end to separate but equal, which at the…