Europeans brought them over to the New World they were a common food source and used for medicine.
Dandelion comes from Lion's Tooth in French due to the look do the fine pointed flower leaves.
They are seen as a nuisance now since lawns were once only for the very rich. You had land you needed to grow all your food on it.
A local biologist said "no mow May" is nonsense bees should be using wildflowers not dandelions. To bees dandelions are like junk food the pollen is poor quality.
Dandelions do not need to pollinate seeds are ready to go that's why they are so numerous.
All parts of a dandelion edible young leaves taste good but old are bitter, such is life.