First the patriarchy destroyed itself in an ill-conceived attempt to eliminate male homosexuality.
In the 1950s and 1960s, having discovered that certain progesterone analogues could increase attraction toward womyn and reduce attraction toward men, various offices used these on 'suspected homosexuals' and the military used these on their own soldiers in the Cuban War, eventually introducing these progesterone analogues into the water supply of Miami, New York, and several other major cities. In typically male-minded fashion, they focused on the short-term foreground changes in sexual attraction in men, but failed to study the short-term changes in sexual attraction in womyn, assuming the same drugs would increase attraction toward men. In addition, they ignored the gradual increase in depression and headaches, which are now known to be the product of a long-term background change in sexual identity and the resulting neuroendocrine incompatibility with male hormone levels.
In the 1960s and 1970s, underground pharmacists began to produce the same progesterone analogues, as well as regular and emergency contraception, estrogen, and progesterone. The progesterone analogues became a symbol of liberation and solidarity for some womyn, increasingly many womyn, and were eventually nicknamed lesbian concentrate. The Kennedy administration was unable to shut down the hormone trade, and the McCarthy administration was unwilling to continue the failed policy.
In the 1970s through 1990s, as more and more womyn embraced lesbianism, heteropatriarchy began to break down. Womyn were able to control their own bodies, rejecting penis-in-vagina, and ending forced birth. Owing to widespread social separation between womb-bearing and most wombless womyn in the WSA, womyn who chose to bear children generally chose in vitro fertilization over traditional 'baster' fertilization, but early in vitro techniques led to significantly more wombless [Wolffian] births than womb-bearing [Müllerian] births. At the time, most wombless children were believed to be boys and were expected to grow into men. Owing to strict restrictions on transition, and later criminalization of transition, less than 20% of the camab population had transitioned by the beginning of the Civil War.
In the 1990s through 2010s, after the Civil War, with fewer barriers to transition, and fewer barriers to transitioned womyn's participation in society, cissexism began to break down. More than 80% of the camab population had transitioned within 15 years of the end of the Civil War. At the time, some were concerned that a growing trans majority might lead to neglect of cis-specific concerns, and cis-specific coverage in the Womyn's Health Service. Owing to substantial immigration, however, trans people have not exceeded 70% of the population.
At present, with improved techniques for in vitro fertilization, the revival of traditional 'baster' fertilization, and the birth assignment lottery, most demographers believe that the present situation is at or near 'peak trans,' and expect the rate of transsexualism to gradually fall to 50% of the population.
Although this was written in response to an anti-trans site, this is intended to parody my own attitudes, and my own trans-womon-specific approach to feminism, not theirs.
Also, I know gender stereotypes are strange now, and I expect they will get stranger if people never, or hardly ever, meet the genders they're stereotyping. It would create some strange ideas about what men are/were, hence the comment about male-mindedness above. I don't intend any offense.