Diana: Here is an article for you:
http://gothamist.com/2015/06/14/nyu_pro ... pokane.phpSex addresses differences in biological makeup, like sex organs and chromosomes.
Gender means characteristics that society decides are masculine or feminine. They are ideas of how "men" or "women" should behave, dress, or what they take interest in. Not all people fit neatly into the categories of strictly masculine or strictly feminine. The way I understand transgender is not conforming to the ways that were assigned to their sex.
Now,
race is something you are born with. Your natural skin color, hair color, bone structure, etc. are all components of race. It doesn't matter where you were born or what upbringing you had. Race is
unalterable.
Ethnicity on the other hand can be changed or adopted. You can change your customs, beliefs, traditions, etc. to match with the ethnic group you identify with.
The situation at hand is about race, not ethnicity.
Lemon Cheesecake: You have a lot of strong arguments. Rachel Dolezal has openly described herself as trans-racial. I think that some people might be offended because she held a position in which she represented people she made believe she was "one of them". I personally disagree with this; I'm just trying to put a different perspective on this. If her only intention was to benefit her community, I believe it shouldn't matter what race she comes from. But her lie was unnecessary.
Ryvvi: I haven't heard the details about being born in a tee-pee. Apparently she asked her family to lie for her and not to "blow her cover" (mentioned in the article).
The last thing you said was a point of mine - just because you get a tan and crimp your hair doesn't mean that suddenly your ancestors were chained and brought to this country.