Is this a weed, or flower?

by Angela
(Kansas, USA)

We live in southeast kansas and in our backyard we have up to 20 of these flowers scattered in various places. They are very pretty but I am in an arguement with my husband on whether they are weeds or not
This was the biggest one and the stalk was VERY long, roughly 3 1/2 feet tall and the 'bloom' is bigger than my fist
Can anyone identify it? I would appreciate it! thank you!