Identity in feminism

Both of these authors Audre Lorde, the author of an essay titled The Master's Tools Will Never Dismantle the Masters House and Adrienne Rich the author of Notes Toward A Politics Of Location, seem to be from very different, contrasted backgrounds.  Lorde is a black, lesbian, feminist who feel that feminism cannot be defined by a single list of goals, motives and shared struggles; rather feminism is divided into many different categories like race, country of origin, class and so on and so forth.  Lorde expresses that she believes that woman are constantly called to fill men in where they are ignorant of woman and that men and the nature of a patriarchal society speaks volumes to the ignorance of men.  This sort of frustration, I find merited as Lorde points out that with different social-economic status and related factors such as race the struggles for women can be entirely different.  This seems to relate to a idea presented by Rich as she views the world and her existence as one small piece of an ever expanding universe with untold diversity.  There are signs in each essay that suggest that diversity is a source of power.  Lorde says this directly; however Rich seems to more subtly approach this conclusion as she addresses the it with questions like, "Who is we?" (41).  For Rich there are many questions involving identity of a personal and collective matter, nevertheless Rich recognizes on page 38 that once something that needs to be changed is identified that the "we" has the power to change it.  The only issue that remains is finding out who the we is.  Is the we feminists in general, or black feminists, or white, or third world, or lesbian feminist?  To what extent does the establishment of identity lend itself to power for change?  Do you need a large group or many small groups with similarities that bind them?