Just a little pie chart to ponder... First, the demographic percentages of the US's major minority populations:
...versus the google results for their respective national, month-long cultural observances.
Timeline:
Black History Month began in 1893 as Colored American Day.
Women's History Month began in 1911 as International Women's Day.
Native American Heritage Month began in 1915 as American Indian Day.
Hispanic Heritage Month began in 1968 as Hispanic Heritage Week.
Asian Pacific American Heritage Month began in 1978 as Asian American Heritage Week.
Gay and Lesbian Pride Month began in 2000.




