Encyclopedias and other reference sources are excellent starting points for your research. You can explore possible topics and get basic factual information before moving to more detailed primary and secondary sources.
Black Women in America by 
The Oxford Handbook of American Women's and Gender History by 
Women's Rights in the United States: a Comprehensive Encyclopedia of Issues, Events, and People by 
Women in American History: a Social, Political, and Cultural Encyclopedia and Document Collection by 
The American Women's Almanac: 500 Years of Making History by 
