This is not to remotely excuse the actions of the US government & eugenicists, who were absolutely carrying out crimes against humanity. It's just that they were far from the only ones doing it at the time, and the US laws were not uniquely American in origin.
I wasn't claiming that eugenics was a uniquely American idea so much as the way it was implemented and sold to the public was the model by which Nazi Germany designed their own. They were remarkably similar, Germany's came after, and I'm psure there are letters and records of Nazis praising the US
They did praise the US (and UK, and Brazil) but the Nazis really leaned on their colonial anthropology work, & historic antisemitism in designing their policies. Also, Germany didnt exactly sell their policies to the public they were established by dictatorial decree & justified by the enabling acts