Marvel Comics is far more realistic than DC in the aspect of diversity...
X-Men served as social commentary....
how society treats those that are different = human/mutant relations
philosophical opposing viewpoints from Professor X/Magneto....
DC was just a bunch of white men in tights...
Justice League for the longest had no Blacks, Hispanics, Asians or Jews...
now for Marvel...
African American: Blade, the Prowler, War Marchine, Black Panther, Luke Cage, Storm, Maggot, the Falcon, Bishop, Night Stalker (New Warriors), Nick Fury(Ultimates),M (Generation X)
Hispanic: Sunspot, Thunderbird III
Native American: Thunderbird I and II
Asian: Lady DeathStrike, Sunfire, Silver Samurai, The Wasp(Ultimates), Psychlocke(merged with Revanche), Northstar, Jubilee
Jewish: Magneto
Gay: Northstar