So you mean like:
Hispanic?
Asian?
Jamaican?
German?
Italian?
etc.?
....we have all those...people just want to be contentious and get angry about the shortest month for blacks? Awkward.
EDIT: if you're requesting WHY it is relevant...?
For centuries, the role that blacks, not to mention Hispanics, Native Americans and Asian Americans, played in shaping American society was left out of history books. To counteract this problem, historian Carter G. Woodson campaigned for what was known in 1926 as Negro History Week. Later, this week morphed into Black History Month, a time for the nation to recognize the major milestones and key figures in African-American history.( Nadra Kareem Nittle about.com)