What is the difference between a Spanish American and an Iberian American?

A Spanish American is not the same thing as an Iberian American.

The Iberian Peninsula is mostly occupied by Spain, but it also includes Portugal. Iberian Americans can come from either country.

The famous Rock of Gibraltar is a limestone promontory connected to southern Spain by a sandy strip of land.

Populated by about 30,000 people, it has belonged to Britain since the eighteenth century.