<P> The expedition established the remainder of the boundaries of the Gulf of Mexico , while disproving the idea of a sea passage to Asia . It also verified that Florida was a peninsula instead of an island , and allowed Álvarez de Pineda to be the first European to see the coastal areas of what is now western Florida , Alabama , Mississippi , Louisiana , and Texas , lands he called `` Amichel . '' His map is the first known document of Texas history and was the first map of the Gulf Coast region of the United States and is stored at the Archivo General de Indias in Spain . </P>
<P> The expedition established the remainder of the boundaries of the Gulf of Mexico , while disproving the idea of a sea passage to Asia . It also verified that Florida was a peninsula instead of an island , and allowed Álvarez de Pineda to be the first European to see the coastal areas of what is now western Florida , Alabama , Mississippi , Louisiana , and Texas , lands he called `` Amichel . '' His map is the first known document of Texas history and was the first map of the Gulf Coast region of the United States and is stored at the Archivo General de Indias in Spain . </P>
who mapped the coastline of texas in 1519
who mapped the coastline of texas in 1519
Álvarez de Pineda
Álvarez de Pineda