iirc the Dandelions we know are are native to Eurasia and are considered invasive across the US. They were brought over by early settlers for their health benefits

i have heard they were a garden plant but i dont know if that was an informal "spread the seeds and harvest where they pop up" or more of a row crop kind of thing...

My understanding is that they aren't nearly as problematic as some other non-native plants though, like veldt grass, pampas grass, English ivy, sourgrass (African wood-sorrel), ice plant, Himalayan blackberry, cotoneaster, periwinkle, etc.