MAGA MAN
Let's go Brandon!
The furthest South I have found them is the Peconic bay in Eastern Long Island, but they are very abundant in Cape Cod and run North to at least Nova Scotia.
My grandmother's family were from Gloucester, Cape Ann, and we spent summers there until I was about 16. Soft shells, steamed in a big aluminium pot, melted butter and corn were a staple. Then my parents bought a place on Cape Cod and we discovered quahogs. Much preferred.