I wanted to drop some American short stories that I recommend.
Since you can't buy 1 book with all of them I've linked an online source that you can print if you love paper.
If you like a story I recommend getting the book that the story is a part of.
In no particular order:
Pastoralia by George Saunders (2000)
Defender of the Faith by Philip Roth (1959)
Sonny's Blues by James Baldwin (1957)
Love and Honor and Pity and Pride and Compassion and Sacrifice by Nam Le (2012)
People Like That Are the Only People Here: Canonical Babbling in Peed Onk by Lorrie Moore (1997)
Rock Springs by Richard Ford (1987)