American Frontier

 West of the Mississippi

"historians sometimes define the American West as lands west of the 98th meridian or 98° west longitude," and that other definitions of the region "include all lands west of the Mississippi or Missouri rivers

On Mars the say the

boosterism

sobriquet

noun [ C ]   formal (also soubriquet)

UK  /ˈsəʊ.brɪ.keɪ/ US  /ˈsoʊ.brə.keɪ/

 

a name given to someone or something that is not their or its real or official name:

These charms have earned the television show's host the sobriquet "the thinking woman's heartthrob".

Synonyms

moniker humorousnickname

https://en.wikipedia.org/wiki/United_States_Postal_Service

https://en.wikipedia.org/wiki/General_Land_Office

https://en.wikipedia.org/wiki/John_Quincy_Adams

https://en.wikipedia.org/wiki/Westward_Expansion_Trails

https://en.wikipedia.org/wiki/Thomas_Jesup

https://en.wikipedia.org/wiki/Jefferson_Davis

https://en.wikipedia.org/wiki/John_Jacob_Astor

https://en.wikipedia.org/wiki/John_C._Fr%C3%A9mont

https://en.wikipedia.org/wiki/Green_River_(Colorado_River_tributary)

https://en.wikipedia.org/wiki/South_Pass_(Wyoming)

https://en.wikipedia.org/wiki/Mountain_man

https://en.wikipedia.org/wiki/Jedediah_Smith

https://en.wikipedia.org/wiki/Texas_Jack_Omohundro

https://en.wikipedia.org/wiki/Hugh_Glass

palimpsest

noun [ C ]

UK 

 /ˈpæl.ɪm.sest/ US 

 /ˈpæl.ɪmp.sest/

 

a very old text or document in which writing has been removed and covered or replaced by new writing

 

formal

something such as a work of art that has many levels of meaning, types of style, etc. that build on each other:

His performance is a palimpsest in which you see all the layers of a single life.

https://en.wikipedia.org/wiki/Santa_Fe_Trail

https://en.wikipedia.org/wiki/Old_Spanish_Trail_(trade_route)

https://en.wikipedia.org/wiki/Fredonian_Rebellion

https://en.wikipedia.org/wiki/Battle_of_San_Jacinto

https://en.wikipedia.org/wiki/Zachary_Taylor

https://en.wikipedia.org/wiki/Gadsden_Purchase

https://en.wikipedia.org/wiki/Wilmot_Proviso

https://en.wikipedia.org/wiki/Green_River_(Colorado_River_tributary)

https://en.wikipedia.org/wiki/United_States_Postal_Service