This wiki-article specifically mentions that the legal doctrine which allows interstate commerce clause to apply here stems from this 1942 precedence, where som

This wiki-article specifically mentions that the legal doctrine which allows interstate commerce clause to apply here stems from this 1942 precedence, where someone's growing of wheat locally for only his own farm animals was considered participation in interstate commerce (!): https://en.wikipedia.org/wiki/Wickard_v._Filburn https://en.wikipedia.org/wiki/Wickard_v._Filburn