NiceGerbil,
My understanding is that.
USA do not have the same sort of global equalities laws that we have.
In some/ many (?) states employers can sack you if they find out you're gay/ lesbian, housing can be denied etc etc.
So the fight for equality/ anti discrimination laws for gay and lesbian people is ongoing.
The T has been bundled in with this.
This is true. I think this 2007 article by John Aravosis, a gay Democratic activist, outlines a lot of the US political history on this topic well.
www.salon.com/2007/10/08/lgbt/
How Did the T Get In LGBT?
In simpler times we were all gay. But then the word "gay" started to mean "gay men" more than women, so we switched to the more inclusive "gay and lesbian." Bisexuals, who were only part-time gays, insisted that we add them too, so we did (not without some protest), and by the early 1990s we were the lesbian, gay and bisexual, or LGB community. Sometime in the late '90s, a few gay rights groups and activists started using a new acronym, LGBT -- adding T for transgender/transsexual. And that's when today's trouble started.
It is interesting to read this account in light of the Denton’s document. www.google.com/amp/s/www.spectator.co.uk/article/the-document-that-reveals-the-remarkable-tactics-of-trans-lobbyists/amp