The Ox-eye Daisy is very common along roadsides, in fields and waste places in the United States and Canada. Maybe it’s so common because it is an introduced or alien plant that isn’t native to this part of the world.
The white petals and yellow “eye” are really the ray and disc flowers of this perennial, composite flower, Leucanthemum vulgare.
Like many of the composites this wild daisy can be mowed over and it will regenerate another set of flowers.