Those are in the Campanula family. These are the ‘wild ones’ that most folk call ‘Harebells.’
(That was easy; I had a customer bring in a handful of that for ID last week!)
And I hope you like them because you’ll have them forever! Hard to kill and pretty invasive. The newer cultivars have larger flowers and more colors (blue, white pink) and aren’t as over-powering of other plants.
Wild or not I let them grow. In fact I dug out a big clump of tiger lilies that were starting to choke them out. I’ve never found them when I wander the state land.
I’ve also got several patches of Oxeye daisies that I let grow every summer.