An armistice is best defined as a

A: formal warning if impending military action
B: stockpile of military weapons
C: go-between for two warring nations
D: formal agreement to end warfare

D.

Pretty much a truce

Explanation:

Henri de Tonti helped establish the first permanent European settlement in the lower Mississippi River Valley in 1686. It was called the Poste aux Arkansas, or Arkansas Post (Arkansas County). As a result, de Tonti is often called the “father of Arkansas.”