um ", ▁collection ▁R ij ks museum ▁ ▁Port rait ▁of ▁Jacob ▁de ▁Wil de ; ▁collection ▁R ij ks museum ▁ ▁Category : 1 6 4 5 ▁birth s ▁Category : 1 7 2 1 ▁death s ▁Category : B ur ial s ▁at ▁the ▁O ude ▁K erk ▁( Am sterdam ) ▁Category : D utch ▁num ism at ists ▁Category : 1 7 th - century ▁Dutch ▁people ▁Category : Pe ople ▁from ▁The ▁H ague ▁Category : Collect ors <0x0A> </s> ▁This ▁article ▁is ▁about ▁the ▁ 1 8 1 9 ▁Y ellow stone ▁expedition . ▁For ▁the ▁expedition ▁of ▁Lewis ▁and ▁Clark , ▁see ▁Lewis ▁and ▁Clark ▁Ex ped ition # J our ney . ▁ ▁The ▁Y ellow stone ▁expedition ▁was ▁an ▁expedition ▁to ▁the ▁American ▁front ier ▁in ▁ 1 8 1 9 ▁and ▁ 1 8 2 0 ▁author ized ▁by ▁United ▁States ▁Secretary ▁of ▁War ▁John ▁C . ▁Cal h oun , ▁with ▁the ▁goal ▁of ▁establish ing ▁a ▁military ▁fort ▁or ▁out post ▁at ▁the ▁mouth ▁of ▁the ▁Y ellow stone ▁River ▁in ▁present - day ▁North ▁Dak ota . ▁Sometimes ▁called ▁the ▁At kin son – Long ▁Ex ped ition ▁after ▁its ▁two ▁principal ▁leaders , ▁Colonel ▁Henry ▁At kin son ▁and ▁Major ▁Stephen ▁Harr iman ▁Long , ▁it ▁led ▁to ▁the ▁creation ▁of ▁Fort ▁At kin son ▁in ▁present - day ▁Neb r aska , ▁the ▁first ▁United ▁States ▁Army ▁post ▁established ▁west ▁of ▁the ▁Missouri ▁River , ▁but ▁was ▁otherwise