southwesterner
/ˌsaʊθˈwɛstənə/ /ˌsaʊθˈwɛst(ə)nə/noun
Chiefly US. A native or inhabitant of the south-western part of a country or region, especially the United States.
Origin
Mid 19th century; earliest use found in American Whig Review. From south-western + -er.