We can't have these debates if, instead of engaging with the issues, you smugly retreat into an endless repetition of 'how can a person change sex?'
I've never heard this question on MN. What I hear is the statement: "A person cannot change sex."
I want a debate about white supremacy and the fact that many cultures across the world (including India, many African tribal societies and a range of Native American cultures) recognised gender as being distinct from biology until the British Empire colonised them and made laws outlawing any deviation from binary sex expression. I want to talk about how it's still an expression of white supremacy to insist that these other cultures had it wrong, that the white European model of binary gender is the only valid one.
Brattle has made some excellent arguments and there's a lot I don't know about LGB+T history, as I haven't followed that debate until recently, being a boring old heterosexual grandmother.
But I CAN speak on behalf of colonised peoples, all three groups you mention, since I have both African and Native American ancestry and upbringing, and a very close association with India, having lived there and studied their myths and ideologies and philosophies on a fairly deep level over decades.
The assertion that it's European colonisers who outlawed and eventually abolished some utopian world of gender-fluid happy magical natives is, sorry, wishful thinking.
I've lived among NA tribes in South America who have managed to uphold their original culture and resist European culture, (women topless, own language etc) and I assure you that the binary expression of sex is even more embedded in such societies as in modern Europe. Men are men, women are women, and they live in almost separate worlds.
As for India have you read the great Hindu epic, Mahabharata? You should, since it probably has the very first literary transsexual character and yes, "transsexual", not "transgender". The princess Amba receives the boon that she can change sex through a mantra, and becomes a man (bodily!) so that she can herself avenge herself of an insult and kill a great warrior, Bhishma, who has divine protection meaning he can only be killed when he chooses death. She becomes the male warrior Sikhandin. The book has many strands, but that storyline is one of the main ones.
Then again, one of the main Mahabharata characters, Arjuna, is cursed with becoming a eunuch for one year, and he basically lives in a woman's body for that year -- a very entertaining year, the Indians have great fun with that storyline, since he wears women's clothing and goes to live in the women's quarters of a palace, teaching the young girls song and dance! A lot of misgendering and confusion ensues....! So yes, the Indians of yore did play around with the idea of changing sex. But still: the basic model, strictly adhered to, is binary: male and female.
In fact, traditional Hindu philosophy, many thousands of years old and at the basis of most Indian culture (and in which Yoga has it's original roots and derives its teaching) expressly repudiates the very existence of gender as a reality. This philosophy sees us all as having a basic consciousness that is free of all attributes, male and female being merely attributes along with others such as profession, nationality, race etc: all only mental concepts, superimposed on that basic consciousness. This true Self- is the actual source of happiness; if you're unhappy if you think you're a woman female you would be equally unhappy if you think you're a man, as both are only mental concepts. It's better to simply be, without thinking I am a man or I am a woman. Your body and its experiences are your given parametres: accept them.
If you know anything of Yoga, you might know that harmony of body and mind is one of the basic aims, the very antithesis of gender dysphoria or concepts of "identity" and "gender" that reject the body's material reality. Rather, it would seek to heal us of body dysphoria of any kind.
White people like to appear oh so woke by citing brown-people traditions, without knowing much about them at all. I've given a quick and clumsy explanation as to how you are usually so very, very wrong. Go and actually live with these cultures and you'd see how quickly your trans-ideas fall away.