Even in the states that are most generous to the trans community, you still need to spend quite a while with psychiatrists and actually live full time and get a note. And then it's usually a total pain in the ass to get any documents changed.
And most states don't allow it without surgery. And some don't allow changing of anything even after it.
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"We like to think the past doesn't have any effect on us, but ignorance of the past can be as dangerous as a ticking bomb."