The name Arkansas is the French interpretation of a Sioux word: acansa, meaning "downstream place." Many state names trace their origin to native American Indian languages.
Arkansas became the 25th state in 1836 (see statehood order) -Arkansas state quarter features a diamond (state gem), rice stalks, a lake bordered by pines (state tree), and mallard duck flying above - public domain image on Wikipedia - see all 50 state quarters