Multiple public school districts in the state of Wisconsin officially added gender fluid ideology as a part if their controversial "Human Growth and Development" curriculum that earned heat from critics in 2022.  While Wisconsin allows districts to tailor their own sex education programs and not all districts are the same, basic lessons in many districts include teaching "gender role stereotypes" to second graders, third graders are urged to investigate their gender identity and sixth graders are instructed to refer to girls as "a person with a vulva."

For 4th and 5th graders in the Superior School District of Wisconsin, the 2023-2024 required resource list includes a cartoon produced by the Canadian Public Broadcasting Service (CBC) called 'Gender Explained.'  This is what they are now teaching to 9-year-olds in WI:

Below is the the portion of the Superior District required curriculum resources list that includes the CBC cartoon:

Gender ideology was initially taught covertly to children by activist teachers across the US, with teacher unions and organizations quietly encouraging the practice while also pushing for secrecy from parents.  Progressives denied the practice for years, claiming that accusations were "paranoia and conspiracy theory" despite ample evidence to the contrary, including teacher's own confessions on social media. 

After exposure became widespread and parents realized that their children were being indoctrinated into the far-left fold instead of being taught reading, writing and arithmetic, the uproar did not lead to a change in momentum or an apology from schools.  Rather, Democrat states and school districts doubled down, admitted that they were teaching gender fluidity to kids and started officially adding the lessons to the curriculum.  This has been the case in Wisconsin.